Internet is a system of computer networks that are spread all over the word the world and use a number of protocol to communicate withe one another such as
Transmission Control Protocol (TCP) and Internet Protocol (IP). Internet is still uncharted and there is no central authority controlling the content of the internet and user connectivity. Any computer with a modem
(a computer interface to standard telephone lines) can be connected to the Internet. Following are two common of Internet connection:

Dial-UP Connections 

Individual subscribers in order to access the internet make use of dial-up connections.
To access the Internet through a dial-up connection you need a personal computer, a modem and an appropriate communication software like the Internet Explorer. In this mode, there is a host which services the client requests for the information . The host is called using a local or toll-free number. 
There are a number of dial-up connection providers is the market, so the user can decide which one to choose depending upon their needs and the services offered by he connection providers.

Direct Connection

Direct connection are those use wireless medium for information transfer. Commonly direct connection
are available to institutions, which lease high-speed connection to regional networks and service providers, An Internet connection using phone lines and modems dose not give users a speedy access to the internet . An Internet connection using ordinary telephone lines has a data transfer rate using a direct connection is of the order of mega characters per second.
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