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What is POP3 and IMAP ? Difference between POP3 and IMAP.

POP3:-
-POP3 stands for post office protocol   version 3.
-It is a simple protocol with limited   functionality which is used for opening   remote e-mail boxes.
-It is a pull protocol.
-It is an application layer protocol.
-A POP3 sever stores message for each   user until the user logs in using e-mail   client and downloads the message to   their  computer.Once the the message is   downloaded ,it(message) is deleted from   the server.
-In POP3,you can access mail from a   single device.once you have downloaded   the mail to your desktop after it you can't   download the same message to your   laptop because the mail had deleted after   first download.
-The transfer protocol of POP3 is   TCP(Transmission control protocol).Post   office protocol version 3 uses TCP for   communication and It uses TCP port 110.
-POP3 is supported by Microsoft exchange server.
IMAP:-
-IMAP stands for internet mail access protocol.
-IMAP is an application layer protocol.
-It is pull protocol means IMAP is used for   retrieving email.
-IMAP allows you to view your email,that's only on the server from multiple devices.
-When you view your email on computer, tablet, laptop;Your email would be exactly same because everything is synchronized.
-The well-known port address for IMAP is   143.
Here one thing is cleared that both POP3 and IMAP is used for retrieving email from an email server. 
Difference between POP3 and IMAP- 
Pop3 is an abbreviation for post office protocol 3 and IMAP is an abbreviation for internet mail access protocol.In pop3 ,you can access mail from a single device whereas In case of IMAP, mail can be can be accessed from multiple devices.The port address of POP3 is 110 whereas the port address of IMAP is 143.In case of pop3 ,you can read the message after the the message is downloaded to your device but in IMAP you don't need to download the message to read.you can read the message on the mail server .IMAP is more flexible and complex than POP3.








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