If you've ever sent or received an email through the Internet, chances are you have used Post Office Protocol (POP). I am owned a website of kochi airport taxi and all of you know that now in the world there is nothing without the internet. All of us uses email for all official as well as personal uses. Post Office Protocol (POP) is an Internet standard (meaning everyone has agreed on how it's structured) protocol for pulling email down from a remote server. We'll break this down into more detail, but to help you visualize this, think about sending a clerk to the mail room to get your mail and he/she brings it back and plops it into your inbox on your desk.

POP is an application layer protocol in the Open Systems Interconnection (OSI) Model. The OSI Model is a theoretical construct used to describe how communications happen across a network. There are 7 layers. The bottom layer, layer 1, is the physical layer; it describes the physical structure data uses to travel across the network, like cabling. Layer 7, the application layer, is the top layer which describes how two applications (think 'programs') talk to each other and this is where POP lives. The current version of POP is the third, or POP3.

So POP is used to help define the conversation (to set the ground rules, if you will) that happens between your device and the remote server somewhere on the Internet that holds your email. Think of your device and the remote server speaking a common language so they can discuss how to get your mail to you. POP is the protocol for pulling your messages down and there's another application layer protocol called Simple Mail Transport Protocol (SMTP) that has rules for sending your messages out. The two protocols work together seamlessly to do the whole job.