Gmail is a free ad-supported email service developed by Google. A user typically accesses Gmail in a web browser or the official mobile app on Android and iOS. Google also supports the use of email clients via the POP and IMAP protocols.
The idea for Gmail was developed by Paul Buchheit several years before it was announced to the public. The project was known by the code name Caribou. During early development, the project was kept secret from most of Google's own engineers. This changed once the project improved, and by early 2004, most employees were using it to access the company's internal email system.
Gmail was announced to the public by Google on April 1, 2004 as a limited beta release and ended in beta on July 7, 2009.
At its launch in 2004, Gmail provided a storage capacity of one gigabyte per user, which was significantly higher than its competitors offered at the time. Today, the service comes with 15 gigabytes of storage, which is divided among other Google services, such as Google Drive, and Google Photos. Users can receive emails up to 50 megabytes in size, including attachments, while they can send emails up to 25 megabytes. In order to send larger files, users can insert files from Google Drive into the message. Gmail has a search-oriented interface and a "conversation view" similar to an Internet forum. The service is notable among website developers for its early adoption of Ajax.
In May 2014, Gmail became the first app on the Google Play Store to reach one billion installs on Android devices. As of 2019, it had 1.5 billion active users worldwide.
According to Wikipedia