What is POP3 email server?? ?

I got a new computer and have long had Yahoo for email. I pressed an email link and -----a new floating window pops up and asks me





1.Incoming email server type-drop- with down menu


2.Incoming mail server (POP or IMAP)


3.Outgoing email server (SMTP) name.





I have no idea how to fill these questions out. No idea what even POP means. Help?

What is POP3 email server?? ?
Settings for Yahoo are


Type of account pop3


Incoming server pop.mail.yahoo.co.uk


Incoming port (pop3) 995,


Outgoing server smtp.mail.yahoo.co.uk


Outgoing port (smtp) 465.


Don鈥檛 forget to enable POP Forwarding in Options/Mail Options when you are logged into your account on the web under IE or Firefox.


Outlook will not be able to work with your account unless you do this