Google Mail, also known as Gmail, is a free e-mail service that is run by Google. It can be accessed on the web, by POP3, or by IMAP. Some of the competitors to Gmail are Yahoo! Mail, Hotmail/Windows Live Mail, and Inbox.Com. The space given to any GMail member is increased a small amount every second, and as of July 26, 2012, Google provides each account with about 10272 MB of space.
Google Apps is a service from Google that was created in February 2006 as Gmail for your domain. It is to allow system administrators of a company or organisation to create email accounts for their own domain.
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Gmail running on Android
Google Mail Facts for Kids. Kiddle Encyclopedia.