What is POP3 protocol?
Post Office Protocol 3 (POP3) is the most commonly used protocol for receiving email over the internet. This standard protocol, which most email servers and their clients support, is used to receive emails from a remote server and send to a local client.
Instruction: What is POP3 protocol?
Context: 
Response: Post Office Protocol 3 (POP3) is the most commonly used protocol for receiving email over the internet. This standard protocol, which most email servers and their clients support, is used to receive emails from a remote server and send to a local client.