(2) A computer that is connected to a TCP/IP network, including the Internet. Each host has a unique IP address.

(3) To provide the infrastructure for a computer service. For example, there are many companies that host files, programs, applications or even a Web server for companies and individuals. In the case of a Web server, it means that they provide the hardware, software, and communications lines required by the server, but the content on the server may be controlled by someone else.

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Web Hosting Tutorial
Provides a basic overview of the main components that enable the Web, presents two basic methods of Web hosting known as dedicated and shared, and discusses the challenges of resource management.

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Yahoo!'s directory of web hosting companies.