The Internet and the World Wide Web

//Internet ≠ World Wide Web

The internet is the worldwide network of connected computers — the infrastructure, including email and file transfer. The World Wide Web is the collection of websites and pages that you access using that infrastructure. The web runs ON the internet.

//The parts of a URL

Know the three parts by name.

https://www.school.edu.mn/notes/binary.html
  |            |                    |
protocol    domain name          file path

//What happens when you visit a page

You type the URL. The browser asks a DNS server for the IP address matching the domain name. The DNS server returns the IP. The browser sends a request to that IP. The web server sends back the HTML. The browser renders it into the page you see.

//Cookies

Small text files stored by the browser. Session cookies are held in memory and disappear when the browser closes — used for a shopping basket. Persistent cookies are saved to disk and survive — used to remember logins, preferences and to target adverts.

CHECK YOURSELF