The internet is tens of thousands of independently run networks exchanging traffic under shared rules called TCP/IP. Data travels in small packets labeled with IP addresses, and DNS translates names like kurums.com into those addresses. The web is one service on top, delivered over HTTP and secured with TLS. For a business, the levers are connection quality, redundancy, DNS and CDN choices, and server distance from customers.
Every time an employee opens a cloud app or a customer loads your product page, dozens of machines owned by different companies cooperate for a fraction of a second. Nobody runs “the internet” as a whole; it works because thousands of operators follow the same open standards.
You do not need to be an engineer to make good decisions about connectivity, hosting or security, but you do need a working model of what happens between a click and a loaded page. This guide builds that model in plain language, then turns it into the decisions and vendor questions that move cost and reliability.
- The internet is a “network of networks” that interconnect at exchange points and through paid transit.
- Data moves as independent packets, which makes the system resilient but sensitive to distance and congestion.
- If your DNS fails, your website and email disappear even when your servers are healthy.
- HTTPS (HTTP plus TLS encryption) is now the baseline for any website, not an optional extra.
- Latency is mostly physical distance, so CDNs and regional hosting often beat a bigger office connection.
What is the internet, physically?
Physically, the internet is cables, radio links and routers: specialized computers that forward incoming data toward its destination. For how local networks fit together first, see our guide to computer networks.
Networks of networks
Each independently run network is called an autonomous system (AS): your broadband provider, a mobile operator, or a company such as Google, Microsoft or Cloudflare. There are tens of thousands of them, and they tell each other which addresses they can reach using BGP (Border Gateway Protocol).
ISPs, transit and the backbone
Local ISPs sell access to homes and businesses and buy “transit” from larger carriers. At the top, a handful of Tier 1 carriers reach every network without paying for transit. Their high-capacity fiber links form the internet “backbone.”
Submarine cables and exchange points
Traffic between continents travels almost entirely through fiber-optic cables on the seabed, not satellites. Several hundred such cables are in service, owned by telecom consortia and, increasingly, cloud giants, and a single modern cable carries many terabits per second.
Internet exchange points (IXPs) are data centers where many networks connect to a shared switch and swap traffic directly, such as DE-CIX in Frankfurt, AMS-IX in Amsterdam and LINX in London; Istanbul and most major cities have one. Exchanging traffic locally (“peering”) is cheaper and faster than routing it through a distant transit provider.
How does data actually travel across the internet?
The internet uses packet switching. Instead of reserving a dedicated line for the duration of a conversation, as the old telephone network did, it chops every file, email or video frame into small pieces called packets. A typical packet carries up to about 1,500 bytes of data, plus a header containing the source address, destination address and other control information. (Our explainer on bits and bytes covers these units.)
A 3 MB product photo therefore becomes roughly two thousand packets, each forwarded router by router (“hops”); a request from Istanbul to a server in Virginia might cross fifteen or twenty routers. Packets can take different paths, arrive out of order, or get lost on a congested link. The receiver reassembles them and asks for anything missing.
This is why the internet survives cable cuts: routers learn about a failed path and send packets another way. The trade-off is variability, which is why the same video call can be crisp at 10:00 and choppy at 20:00.
What are TCP/IP and the other core protocols?
A protocol is an agreed set of rules for communicating. The internet uses a stack of them, each doing one job. IP handles addressing and delivery of individual packets; TCP turns those unreliable packets into a reliable, ordered stream. The ARPANET, the internet’s research predecessor, switched to TCP/IP on January 1, 1983.
TCP opens each connection with a short handshake, numbers what it sends, waits for acknowledgments, resends losses and slows down under congestion. UDP skips those guarantees, which suits live voice, video and games, where a late packet is useless anyway.
| Protocol | What it does | Everyday analogy | Where you meet it |
|---|---|---|---|
| IP | Addresses each packet and routes it toward the destination network | The address written on an envelope | Every device online; IPv4 and IPv6 |
| TCP | Reliable, ordered delivery with acknowledgments and retransmission | Registered mail with numbered pages and a signed receipt | Web browsing, email, file transfer |
| UDP | Fast, connectionless delivery with no delivery guarantee | A live radio broadcast: no replays if you miss a word | VoIP, video calls, streaming, DNS queries, HTTP/3 |
| DNS | Translates domain names into IP addresses | The contacts app that finds a number from a name | Every website visit and email delivery |
| HTTP / HTTPS | Requests and delivers web pages, images and API data | Ordering from a menu and receiving the dish | Websites, web apps, most APIs |
| TLS | Encrypts traffic and proves the server’s identity with a certificate | A sealed, tamper-evident envelope checked against an ID card | The padlock in the browser, secure email, VPNs |
What is an IP address, and why are there two kinds?
An IP address is the numeric label that tells routers where a packet should go. IPv4 uses 32-bit addresses written as four numbers from 0 to 255, such as 192.0.2.44. That allows about 4.3 billion addresses, and the regional registries that hand them out exhausted their free pools during the 2010s.
How the world stretched IPv4
The main workaround is network address translation (NAT). Your office router has one public IPv4 address, while devices inside use private addresses such as 192.168.x.x and the router rewrites packets on the way in and out. Mobile operators do the same at scale. Scarce IPv4 addresses now trade on a secondary market, and cloud providers increasingly charge a monthly fee for each public IPv4 address.
IPv6: the long-term fix
IPv6 uses 128-bit addresses, written like 2001:db8::8a2e:370:7334, giving every device a globally unique address without NAT. As of 2026, Google’s public measurements show roughly half of its users reaching it over IPv6, with wide variation by country. Most systems run both versions side by side (“dual stack”).
Ask whether your ISP, firewall and host support IPv6, and make sure security rules cover both versions; a firewall that filters IPv4 but leaves IPv6 open is a common gap.
How does DNS turn a name into an address?
People remember names; routers need numbers. DNS bridges the gap through a hierarchy of servers that each know part of the answer. A lookup for http://www.kurums.com typically runs like this:
- Check caches. The browser and operating system reuse a recent stored answer if it has not expired.
- Ask the resolver. Otherwise the device asks a recursive resolver run by your ISP, your IT team, or a public service such as Google (8.8.8.8), Cloudflare (1.1.1.1) or Quad9 (9.9.9.9).
- Query a root server. There are 13 named root server identities, served by well over a thousand machines worldwide via anycast. The root replies with the servers responsible for “.com”.
- Query the TLD servers. The .com servers point to the authoritative name servers the domain owner registered.
- Query the authoritative server. The domain’s DNS provider returns the address: an “A” record for IPv4 or “AAAA” for IPv6.
- Cache and connect. The resolver stores the answer for the record’s time-to-live (TTL), from minutes to a day, and the browser connects.
DNS also holds MX records (where your email is delivered), TXT records for anti-spoofing policies such as SPF and DMARC, and CNAME records that connect SaaS tools and CDNs to your domain. Whoever controls your DNS account controls your website and email.
What are HTTP and HTTPS, and what does TLS add?
HTTP is the language browsers and web servers use. The browser sends a request such as “GET /pricing/” with headers and cookies; the server replies with a status code (200 OK, 301 moved, 404 not found, 500 server error) and the content. A modern page can trigger dozens or hundreds of requests for images, fonts and scripts.
HTTP/2 lets many requests share one connection. HTTP/3 runs over QUIC, a newer UDP-based transport that sets up connections faster and recovers better from lost packets, which helps on mobile networks.
Why the “S” matters
Plain HTTP travels as readable text that anyone on the path could read or alter. HTTPS wraps HTTP in TLS (Transport Layer Security), which encrypts the data, detects tampering and verifies through a certificate that you reached the real domain. Since Let’s Encrypt launched in the mid-2010s, basic certificates have been free and auto-renewing, and TLS 1.3 needs one round trip to set up. Browsers flag plain HTTP as “not secure.” Our guide to data protection and encryption covers the cryptography.
HTTPS hides content, but the network can still see which domain you contact and how much data flows, so companies add controls covered in network security basics.
What happens when you type a URL and press Enter?
Put together, a page load follows a predictable sequence. Each arrow below is really many packets crossing several networks.
- Parse the URL into scheme (https), host (www.kurums.com) and path (/pricing/).
- Resolve the name through DNS, from cache if possible.
- Connect over TCP, or QUIC for HTTP/3, to port 443.
- Secure it with a TLS handshake that checks the certificate.
- Request and respond: the web server, usually in a data center or cloud region (see what is a server), returns the page.
- Render and fetch more: the browser requests the stylesheets, scripts and images the HTML references.
To a nearby server, first content can appear in a few hundred milliseconds. The number of round trips, not just file size, largely decides how fast a site feels.
What are CDNs, and why does latency matter so much?
Bandwidth is how much data a connection carries per second; latency is how long one round trip takes. You can buy bandwidth, not physics. Light in fiber travels at roughly 200,000 km per second, and Istanbul to New York is about 8,000 km, so even a perfect direct route needs around 80 milliseconds per round trip. Real routes are longer. A page needing ten sequential round trips to that server will feel slow on any office connection.
A content delivery network (CDN) copies content to edge servers in data centers and exchange points worldwide, so a visitor in Ankara gets images from a nearby location instead of an origin server on another continent. CDNs also absorb traffic spikes, shield the origin, and usually include DDoS protection and a web application firewall; many also host DNS. Faster pages keep more visitors and support search rankings, since search engines weigh page experience.
Latency is also why cloud providers let you choose a region; hosting near your customers, as our cloud computing guide explains, often beats any server tuning.
Is the web the same thing as the internet?
No. The internet is the infrastructure: networks, routers, addresses and transport protocols, with roots in the ARPANET, which carried its first messages in 1969. The World Wide Web is one application on top of it, invented by Tim Berners-Lee at CERN in 1989 as linked documents identified by URLs and transferred over HTTP.
Plenty of business traffic uses the internet without being “the web”: email, VoIP calls, file sync, VPN tunnels and machine-to-machine traffic. The distinction matters when troubleshooting, because “the website is down” and “the internet is down” point to different causes and different people to call.
What does this mean for your business?
A working model turns “the internet is slow” into specific decisions with cost and risk attached.
Connectivity and bandwidth
- Size for upload, not just download. Video calls and cloud backups push data out; business fiber offers symmetric speeds and SLAs.
- Watch latency and jitter. For voice and video, consistency beats headline speed.
- Check the building. Many “internet” problems are weak Wi-Fi; see Wi-Fi vs 5G vs Ethernet.
Redundancy
- Use two ISPs over different physical routes (fiber plus 5G is common) with automatic failover.
- Avoid a single server or data center for customer-facing systems.
- Remote teams need secure access that does not depend on one office link; see our business VPN comparison.
DNS and CDN providers
- Managed DNS adds anycast, DNSSEC and audit logs over registrar-bundled DNS; see our DNS management software guide.
- For international visitors, heavy media or e-commerce, a CDN is one of the cheapest upgrades; our CDN comparison covers pricing from free tiers to enterprise plans.
- Model cloud egress fees, public IPv4 charges, DDoS protection tiers and support levels.
Questions to ask your ISP, host or IT partner
- What is the guaranteed uptime in the SLA, and what compensation applies when it is missed?
- Do you support IPv6, and are our firewall rules applied to both IPv4 and IPv6?
- Who holds the login for our domain registrar and DNS, and is it protected with multi-factor authentication?
- Where are our servers physically located relative to our customers, and do we use a CDN?
Frequently Asked Questions
Who owns or controls the internet?
No single company or government owns it. Tens of thousands of network operators run their own pieces and connect by agreement. Coordination bodies handle shared resources: ICANN and IANA oversee domain names and address allocation, regional registries distribute IP addresses, and the IETF publishes the open technical standards. Governments regulate the ISPs operating within their borders.
Why is my connection slower than the speed my ISP advertises?
Advertised speeds describe the link between you and your ISP under ideal conditions. Real performance also depends on Wi-Fi quality, the number of devices sharing the line, congestion at peak hours, the distance to the server you are reaching, and that server’s own capacity. Test with a wired connection first to separate building problems from ISP problems.
Does HTTPS mean a website is safe to trust?
Not by itself. HTTPS means the connection is encrypted and the certificate matches the domain name, so nobody in between can read or alter the traffic. It says nothing about who runs the site or their intentions. Phishing sites routinely use free certificates, so users should still check the exact domain before entering passwords or payment details.
Does my company need a static IP address?
Only in specific cases: hosting a server in your own office, connecting a site-to-site VPN, or when a supplier only allows access from a whitelisted address. Most businesses that use cloud services and SaaS tools work fine with a dynamic address. ISPs usually charge extra for static addresses, and IPv4 addresses in particular have become scarce and more expensive.
How long do DNS changes take to work?
It depends on the record’s TTL. Resolvers that cached the old answer keep using it until the TTL expires, which can be minutes or up to a day. Changing name servers at the registrar can take longer, sometimes up to 48 hours. The often-quoted “propagation delay” is really caching, which is why lowering TTLs before a planned change helps.
Discover more from Kurums | Business Intelligence
Subscribe to get the latest posts sent to your email.
