Internet service provider
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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 ISP's. They keep connected around the world by giving their clients access to other ISP networks. This is called peering.
There are different types of connections ISP's can offer as well, some might be dial-up, DSL, through optical fiber wires, through a cable television connection, wireless, or even satellite, usually in remote areas. Dial-up is the slowest connection, while a direct fiber-optic connection is usually the fastest.