AOL Mail is a subsidiary of Verizon Communications which is often shorted to AIM Mail, or AOL Instant Messenger.
It is a web-based email service that allows users to stay connected o their friends and families as well as their colleagues with the help of their quick server where sending and receiving emails is very easy.
If you have an i Phone, then you can set up your AOL account using the Mail application.
However, at some point, you will have experienced some issue with your mail.
In this situation, the best solution is to contact the customer support for help.