Internet service provider

organization that provides access to the Internet

An Internet service provider, or ISP, maintains, installs and provides internet connection to residential or commercial areas. Some examples of ISP clients include - homes, coffee shops, hotels, libraries, offices. They usually charge a fee for installing the connection and a monthly fee for maintaining it.

The internet is basically a web of interconnected networks - which are maintained by a huge number of different ISPs. They keep connected around the world by giving their clients access to other ISP networks. This is called peering.[1]

Many ISPs have other services such as e-mail and web hosting service.

ISPs offer different types of connections such as dial-up, DSL, through optical fiber wires, through a cable television connection, or wireless. Communications satellite connections are used mainly in remote areas. Dial-up is the slowest connection, while a direct fiber-optic connection is usually the fastest.

The client computer has a setting (of a specific program or operating system), according to which all network connections over some protocol are made not to the IP address of the server (resource) allocated from the DNS name of the resource or directly specified, but to the IP address (and other port) of the proxy server.[2]


  1. A Border Gateway Protocol 4 (BGP-4). RFC 4271.
  2. Types of servers.