Gmail is a free search-based web-mail service. It offers a full featured web-based email client with search capabilities, a mailbox with Pop and IMAP access, SPAM protection, display of email threads as conversations, a labeling and filtering system, an integrated chat, 10 GB of free storage, etc.
Gmail is free, with contextual ads. Gmail is also marketed as part of 'Google Apps', which is available in a free 'Standard' edition as well as a paid 'Premier' edition. More Info »
Furthermore the storage limit of Gmail can be increased by purchasing additional storage (starting from 5USD/yr for 20GB, for details see https://support.google.com/mail/answer/2375123/ ).
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