Communicating With Email
Pop 3 receives and hold email until the recipient pick's it up. a disadvantage of this is it takes up storage. furthermore you need to go to the email, the email doesn't come to you. Someone that would use pop 3 would be someone that doesn't use emails very often. however pop 3 doesn't take ages to transfer.
imap 4 pushes the email to you. for example, if you receive an email it will tell you on your phone so you can interact with it using more portable devices. imap will push every email onto your phone and it may be unnecessary to receive lots of email you don't need. furthermore without good internet access the data transfer rate can be slow. The type of person that would use this might be a business man who receives lots of important emails and has a good internet connection