E-mail, or electronic mail, is a form of communication that allows users to SEND messages and files over the internet. It is one of the most popular forms of communication today, with the term 'SEND' (4 letters) being used to describe the action of sending an e-mail, and 'writeto' (7 letters) being used to describe the action of writing an e-mail. E-mail has become an essential part of modern life, allowing people to communicate quickly and easily with each other.