Point Of Presence

POP, point of access to the Internet that has a unique Internet address (the size of an Internet Service Provider is measured by the number of access points it has)

A point-of-presence (POP) is an artificial demarcation point or interface point between communications entities.
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A physical layer within a local access and transport area (LATA) at which an inter-LATA carrier establishes itself for the purpose of obtaining LATA access and to which the local exchange carrier provides access services.

(PoP) A site where there exists a collection of telecommunications equipment, usually modems, digital leased lines and multi-protocol routers. An Internet access provider may operate several PoPs distributed throughout their area of operation to increase the chance that their subscribers will be able to reach one with a local telephone call. The alternative is for them to use virtual PoPs (virtual points of presence) via some third party.
(1994-12-13)