How do you want to access your Email?
IMAP
Want to access your email on a number of devices; desktop, tablet and phone?
Then IMAP is for you.
POP
Only want to access your email on one device, say a desktop PC?
Then POP is for you.
Webmail
Access your email on any device (yours or not). Or want to use a free online email service?
Use a web browser for Webmail.