What is POP3email access?

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Other answer:

POP, or Post Office Protocol, is a way of retrieving email information that dates back to a very different Internet than we use today. Computers only had limited, low bandwidth access to remote computers, so engineers created POP in an effort to create a dead simple way to download copies of emails for offline reading, then remove those mails from the remote server.
POP stands for Post Office Protocol, and it's one of the most frequently used methods of downloading email from a server. The other is IMAP (Internet Message Access Protocol).
It's a type of simple email access for retrieving your emails from an email service, using an email program on your computer. It's the traditional way to read emails, although most people use either a web site or a fancier email program (like Outlook) for email these days.
G. Whilikers:
It is one of the two standard ways an email app uses to pick up new messages from the mail server, the other being IMAP. Either are useful if you want to use your email app instead of going to your email provider's web site. POP downloads all the messages at once and usually deletes them from the server, IMAP lets you leave mail on the server and read the ones you're interested in.
POP3 is a protocol for communication between an email client app and an email server, for receiving and sending messages.