This initialism stands for Internet Service Provider. An ISP is an entity, typically commercial, that provides its customers with a connection to the Internet. The connection is normally either digital subscriber line (DSL) or cable broadband, though fiber-optic, wireless, or satellite connections are available. DSL service is carried over telephone lines, while cable broadband uses the cable-television infrastructure.
In a typical arrangement, a customer pays the ISP a monthly fee in exchange for access to the Internet at a defined maximum speed.
For more information: http://en.wikipedia.org/wiki/Internet_Service_Provider
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