It is a google product. Introduced by Google for mail communications. Gmail is the one and only mailing system with high speed and delivery of our mail. Nearly 80% of the world population has gmail account for their personal email communication. Various jobs offer, jobs placement, online transactions mails, comes through gmail. It offers maximum size of attachment in the communication. Withough gmail it is immpossible to send mail so quickly.
There are lots of features in gmail, then you get in hotmail, yahoo mail, rediffmail etc.
The service and support in this product is excellent.