What is the Internet?
The internet is a network of networks. Well the internet is a huge network of millions of connected computer networks. It is used to do many different types of things. For example it connects millions of different devices which can vary from PCs, laptops, phones, PDAs, TVs and even sensors. There are something called end systems or hosts (these can be clients, servers or even both). These send or receive web pages, telemetry, email and even streaming videos. End systems are made from many different types of physical media which can vary from copper wire, fibre optics and even radio. These are connected by communication links.