Contains the full lesson along with a supporting toolkit, including teachers’ notes.
What is the Internet?
The Internet is a worldwide computer network, or more accurately a network of networks, which can be accessed from business and home computers and even from mobile phones. Users can communicate with one another using services such as e-mail, or can retrieve information (data} from other remote host computers. The ‘information’ – which can be text, music, photographs, a movie, animation, an on-line game or other computer programme – is downloaded to the user’s computer in the form of a digital file. The user’s computer is known as the client and the host computer is called the server.
So the Internet, made up of thousands of networks and millions of computers offers:
Strictly speaking the term ‘Internet’ refers to the physical infrastructure. The collection of web pages on the various computers is theworldwide web, often simply called the web. It is literally a web of information because the documents arehyperlinked together. The thousands of computers that make up the Internet are connected by many different types of communication links –cable, microwave and optical fibres.
How do I access the Internet?
Users are generally connected to the Internet by an Internet Service Provider (ISP). ISPs are organisations authorised to connect customers to the Internet. eircom is the largest ISP in Ireland. To connect to the Internet via eircom your computer must first connect to eircom’s server. There are two common ways of doing this, namely dial-up and DSL.