what is INTERNET ?

the Internet, sometimes called simply "the Net" is a worldwide system of computer networks - a network of networks in which users on a computer if they consent, to get information from another computer (and sometimes directly by talking to users in other computers). It is through the Advanced Research Projects Agency (ARPA), the U.S. government in 1969 and was named the first ARPANET.

The initial goal was to create a network that will allow users of a computer in a university research to be able to "talk to" research computers at other universities to create. A side benefit of ARPANET's design was that,  because messages can be routed or rerouted in more than one direction, the network can continue to function even if parts of it were destroyed in the event of a military attack or disaster other. Today, the Internet is a public facility, collective, and self-sustaining accessible to hundreds of millions of people worldwide. Physically, the Internet uses a portion of total resources currently existing public telecommunication networks. Technically, what distinguishes the Internet is used asset protocols called TCP / IP (Transmission Control Protocol for Protocol / Internet). Two recent adaptations of Internet technology, intranet and extranet, also make use of TCP / IP protocol. For many Internet users, almost electronic mail (email) replaced the Postal Service for short transactions in writing. E-mail is the most used application on the Net.

 You can also feed on "Conversations" live with other computer users, using Internet Relay Chat (IRC). More recently, Internet telephony hardware and software allows real-time chat voice. Most used the Internet World Wide Web (often abbreviated "WWW" or called "Web"). Outstanding feature is hypertext, a method of direct cross reference. In most sites, certain words or phrases appear in the text of a different color from the rest, often this text is highlighted. When you choose one of these words or phrases, you will be transferred to the site or page related to that keyword or phrase. 

Sometimes there are buttons, images, or parts of images that are "removed." If you place your cursor over a site and the cursor turns into a hand, it shows that you can click and be transferred to another site. Using the Internet, you can access millions of pages of information. A browser is done with a browser, the most popular of which is Microsoft Internet Explorer and Netscape Navigator. The occurrence of a particular site may vary slightly depending on what browser you use. Even later versions of a particular browser are able to more "bells and whistles" such as animation, virtual reality, audio and music files to give than previous versions.