what is it?
Gmail is -
Gmail is a free, search-based webmail service that includes 1,000 megabytes (1 gigabyte) of storage. The backbone of Gmail is a powerful Google search engine that quickly finds any message an account owner has ever sent or received. That means there's no need to file messages in order to find them again.
When Gmail displays an email, it automatically shows all the replies to that email as well, so users can view a message in the context of a conversation. There are no pop-ups or untargeted banner ads in Gmail, which places relevant text ads and links to related web pages adjacent to email messages.
this service is offered by Google and has quite a few great features for people who cannot keep up with their email or have older systems that need more space --
Alot of info is avialable online about the benefits and features