Computer network and the internet system are the global system of interconnected people worldwide.

The internet, the world’s largest, fastest-growing network, was once primarily a government and research network. Today, it is experiencing expansive growth, perhaps doubling every 6-15 months. The bulk of internet traffic is e-mail.  How do you get on the internet? There is no master computer that everyone dials into. The net, as it is called, is simply a web of interconnected computers around the world. Still, you can dial into the internet from nearly anywhere on earth, as long as you have a correctly connected access computer.
Computer network and the internet

One thing to find out when you’re looking into internet connection is whether you will be getting full access or e-mail only. E-mail gives you virtually instantaneous worldwide communication software games pictures and other riches.

In general the primary providers of internet access ate the following
# School or work: the people with the easiest access to the internet are those involved with universities and colleges government agencies and some commercial businesses some college students can get a free account through their institution. Some campuses also allow local residents access for a monthly fee.

# Commercial on-line services and bulletin boards: Many of the large commercials online services offer access to the internet although mostly only email connection. Some electronic bulletin board systems (BBSs) also offer internet access but again usually just email connection.

#Commercial access providers: Companies exist. called service providers that will connect users to the internet for a fee from a few dollars an hour to thousands of dollars a year. Two basic kinds of commercial access are available: and dial-up connections, including SLIP and PPP.

1. Dedicated access is designed for businesses and costs thousands of dollars. With this service, a computer in your company will have full access to a local area network has access to the internet.

2. A dial-up connection is the cheapest kind of internet access. Here the commercial access provider charges a monthly and or hourly fee for dialling into an intermediary source that then connects to the internet. SLIP (serial line internet protocol) and PPP (point-to-point protocol) are software programs that help connect to the internet through your telephone line (PPP is more sophisticated and faster than SLIP. ) it is less expensive then dedicated access. However, it may still be pricey perhaps up to a couple of hundred dollars a month. (Users must be sure that their systems are up to date enough to support the use of this software.)

The principal features of the internet are email file transfer, remote log-in, conferencing, and information search.
# E-mail: email messages on the internet can be transmitted from one user to another often In a matter of seconds. Email addresses may look a bit odd, but they are not hard to understand. For example, to reach the president of the United States, you would type presidents@whitehouse. gov. The first part is the users name in this case president. The second part is the user’s computer, which follows the @sign-in this case @Whitehouse. ( if you were sending a message via the internet to someone who has an email box with America online this would be @alo.) The third part following a period is the networks domain in this case Gov for government other domains are com (commercial organization including online services such as America online and CompuServe), .edu (education), mil (military) net (network resource) and org (private organization) a user of Delphi receiving messages via an internet gateway would have an address of username@delphi. com

Remote log-in: using the internet protocol called telnet you can sign in to a remote computer. This feature enables you to tap into public access files as though you were connected locally (directly). It is especially useful for perusing large databases or library card catalogs.

Conferencing via Usenet: one of the internet’s most interesting features is its news groups or bulletin board discussion groups for example; Usenet is a loose confederation of computers that exchange electronic mail and bulletin board messages. Although it overlaps with the internet, the two are not the same. Usenet news groups forums cover more than 2000 topics. 

Information searches: several software tools (called gophers or browsers’) exist to help sift through the staggering amount of information on the internet examples are gopher, a campus-wide service used by many colleges and universities to provide information through a simple menu display, and mosaic www for world wide web also called the web is another through a sophisticated graphical user interface. Other popular search tools are Archie, veronica, Netscape and ways (wide area information services) most of these software packages are also available (for –the-shelf software packages are also available (for purchase) to assist users in navigating the internet examples are internet in a box internet express the internet chameleon superhighway access for windows and the internet membership kit. 

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