E-mail stands for Electronic Mail. This is the internet's improved post office.
With E-mail you write a letter on the computer and send it to another person's Internet address, much like you would when mailing a letter, except it does not require a stamp. Actually, it costs you nothing.
In most cases, the message gets anywhere in the world in less than one minute. You cannot send a package like you would with a shipping company, but you can attach a file.
The addressee will get this 'letter' the next time he or she checks for new E-mail on his or her computer.