The Internet vs the World Wide Web
These two terms are often confused but are distinct:
| The Internet | The World Wide Web (WWW) |
|---|
| A global network of networks — the physical infrastructure (cables, routers, servers) | A service that runs on the internet — a collection of web pages and websites accessed via a browser |
| Carries many services: WWW, email, VoIP, FTP, streaming | Uses HTTP/HTTPS to transmit web pages |
| Existed before the WWW (ARPANET, 1960s) | Created by Tim Berners-Lee in 1989 |
URLs (Uniform Resource Locators)
A URL is the address of a resource on the web. Its components are:
https://www.cszone.co.uk/lessons/topic5
│ │ │ │
Protocol Domain name TLD Path/page
- Protocol: http or https (how the data is transferred)
- Domain name: the human-readable address (e.g. cszone.co.uk)
- Top-level domain (TLD): .com, .co.uk, .org, .edu
- Path: the specific page or resource on the server
Domain Name System (DNS)
Computers communicate using IP addresses, but humans use domain names. The DNS (Domain Name System) acts like a phone book — it translates domain names into IP addresses.
Process:
- User types www.cszone.co.uk into the browser
- Browser checks its local cache for the IP address
- If not found, the request goes to a DNS resolver (usually provided by the ISP)
- The resolver queries DNS servers to find the IP address for cszone.co.uk
- The IP address is returned; browser connects to the web server at that address
Web Hosting and Servers
A web server stores website files and responds to HTTP/HTTPS requests from browsers. Web hosting is the service of providing this server infrastructure. When you access a website, you are downloading files from the web server hosting that site.
The Cloud
Cloud computing means storing data and running applications on remote servers accessed over the internet rather than on the local device.
- Advantages: Access from any device/location; no local storage needed; automatic updates and backups; scalable
- Disadvantages: Requires internet connection; security/privacy concerns; ongoing subscription costs; dependent on third party
📝 Exam Tip: Never confuse the internet and the World Wide Web in an exam. The internet is the global network infrastructure. The WWW is a service that uses the internet. The WWW uses HTTP/HTTPS; the internet also carries email (SMTP), file transfer (FTP), and VoIP.
⚠️ Common Mistakes
- Saying "the internet and the World Wide Web are the same thing" — they are not; WWW is one service on the internet
- Forgetting what DNS does — it translates domain names (like google.com) into IP addresses; without DNS, you'd need to type IP addresses to visit websites
- Saying HTTPS is faster than HTTP — it is slightly slower due to encryption overhead, but far more secure