Gmail is a free, search-based e-mail (Web mail) service, which is accessible from a Web browser anywhere in the world. Gmail includes more than 2,000MB (two gigabytes) 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. When Gmail displays an e-mail, it automatically shows all the replies to that e-mail 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 e-mail messages.
As of June 2005, Gmail is presently part of a preview release and limited test accounts are available.