Ever since computers have been networked together, people have used the network to send messages
back and forth. There are several ways to send messages over the internet, but email is the most
popular. If you have an email account, you can send a message to anyone else who also has an email
account, provided you know their email address. The really
convenient thing about email is that it automatically
adjusts to everyone's schedule: you send messages
whenever you get around to it, and the recipients can read
and answer them whenever they get around to doing so.