IMAP and POP are different protocols for handling e-mail. Each has its own unique function and purpose.

POP
POP (Post Office Protocol) delivers your mail from the server in one go. You connect to your mail server (through an Internet connection),
download a copy of your awaiting messages via POP, and then disconnect.

POP is a one-way ticket. By default, POP deletes mail from the server once it has been retrieved by you. You can opt to leave a copy of
the message on the server to be downloaded again later if necessary (by another device or program, for example), but there is no two-way
synchronization between your device and your mail server.

POP is perfect for quickly downloading emails and reading them on the go.

IMAP

IMAP (Internet Message Access Protocol) is true two-way email management. Any change you make in any IMAP client will synchronize with the
server.

This means any email read on your device will also automatically appear read when you check your account later via webmail or your desktop
computer. Any messages or folders you read, move, or delete will be updated across all devices.

IMAP also supports offline use, so any changes made without an Internet connection will be updated when you connect to the server again.
All messages are permanently stored on the server until purposely deleted.

IMAP is newer and is perfect for multiple users who need to access the same email account or for anyone who needs to access one email
account from multiple devices.

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