POP is an application-layer Internet standard protocol used by local e-mail clients to retrieve e-mail from remote servers over TCP/IP connections. POP and IMAP are the two most prevalent protocols for email retrieval, with POP3 being the current standard version of POP that is supported by nearly all modern email clients and servers.

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2. application-layer Internet standard protocol used by local e-mail clients to retrieve e-mail from a remote server over a TCP/IP connection. POP and IMAP (Internet Message Access Protocol) are the two most prevalent Internet standard protocols for e-mail retrieval. Virtually all modern e-mail clients and servers support both. The POP protocol has been developed through several versions, with version 3 (POP3) being the current standard.