Internet Service Provider

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Internet Service Provider

(company, networking)
(ISP) A company which provides other companies or individuals with access to, or presence on, the Internet. Most ISPs are also Internet Access Providers; extra services include help with design, creation and administration of World-Wide Web sites, training and administration of intranets and domain name registration.
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ISP

(1) See in-system programmable.

(2) (Image Signal Processor) See image processor.

(3) (Internet Service Provider) An organization that provides access to the Internet. Connection to the user is typically via cable, DSL or FiOS; however, ISPs can deliver service via satellite, dial-up, ISDN, private lines and wireless. Customers are generally billed a fixed rate per month, but other charges may apply. Some ISPs have a limit on the amount of data transfer per month and charge extra for overage (see data cap). See DSL, cable Internet, FiOS, T1, T3, WISP and SISP.

Your Own Website
ISPs often host a small website for their customers, allowing them to have a presence on the Web. However, the website may be limited to a maximum number of pages, and the domain name of the ISP becomes part of the customer's URL address. For a fee, an ISP may host a website that uses its customer's proprietary domain name (see Web hosting). See download vs. upload, IXP and backbone.


How They're Connected
Small ISPs hook into regional ISPs or directly into major backbone providers. This diagram shows a local ISP confined to a single county, and a regional ISP confined to a state. In practice, ISP networks often have irregular boundaries that span jurisdictions.








ISP Architecture
This diagram shows how a typical, small ISP might be connected to the Internet.
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