The Internet

The Internet

1. What is it?

   • A group of Inter-connected Networks

2. World Wide Web (WWW)

   • A collection of web pages
   • Stored on computers all over the world
   • Accessed via the Internet
   • No central storage
   • No owner

3. Uniform Resource Locator (URL)

   • URL is a web address
     • www.abc.co.uk/images/logo.jpg
       • Hosted on the WWW
       • Name of organisation
       • A company
       • UK based
       • Folder location and filename on the site
   • All web addresses are unique

4. Domain names

   • .uk
     • UK
   • .fr
     • France

5. HyperText Transfer Protocol (HTTP)

   • A protocol is a set of rules
   • HTTP defines the rules used by web browsers and servers to exchange information.
   • If everyone follows the same set of rules, everything works.

6. Data packets

   • Data transmitted over the internet is broken down into smaller chunks or packets to be sent.
   • The destination and sender's addresses are added
   • Each packet is numbered, sent separately, then put in the right order again at the other end

7. Domain Name Server (DNS)

   • A DNS converts a web address or URL into the correct IP address for the computer that the web site sits on