POP may refer to any of the following:
1. Short for Post Office Protocol, POP or POP mail is one of the most commonly used protocols used to receive e-mail on many e-mail clients. There are two different versions of POP: POP2 and POP3. POP2 was an early standard of POP that was only capable of receiving e-mail and required SMTP to send e-mail. POP3 is the latest standard and can send and receive e-mail only using POP, but can also be used to receive e-mail and then use SMTP to send e-mail.
Tip: If you are looking for your POP address or POP server, this information is only obtainable from your ISP or e-mail provider.
2. Short for point of presence, POP is a physical location within a telecommunications provider that an ISP uses to house its network servers, routers, and other equipment. A POP allows them to connect to the Internet and share that connection with their clients.
my @example = ('one', 'two', 'three');
my $lastexample = pop @example;
print "$lastexample\n"; #Prints: three
print "@example"; #Prints: one two
4. The term pop is used as an alternative way of saying respawn in a game.