Q.Mention the uses of internet.

The internet is a worldwide interconnection of millions of computers through a complex web of networks — in effect a "network of networks" that provides an inexpensive, public medium of communication. It grew out of ARPANET, a network started in the 1970s by the Advanced Research Projects Agency of the United States; use spread from the military to government, then to educational institutions, and the network finally became public in the early 1990s.

Today the internet is used chiefly for two things: to communicate — exchanging business and personal information through services such as e-mail, chat and e-commerce — and to share resources such as files, information and services stored on computers everywhere. An ordinary user reaches the internet through a device (laptop, cell phone or PDA) connected, by wire or wirelessly, to an Internet Service Provider (ISP).

The ISP is a company that supplies the actual connection to the internet for both individuals and organisations. It provides communication software and services such as e-mail, chat and e-commerce, and can also host or help build websites for its subscribers. An ISP has one or more towers to which thousands of subscriber cables and modems connect. To carry traffic beyond its own users, ISPs are joined to one another through Network Access Points (NAPs) that link onto the internet backbone or "cloud".

This layered arrangement — user to ISP, ISP to ISP via NAPs — is how a single computer reaches the whole world.