E-mail is another part of the net - which allows you to exchange messages using this network of linked computers.
You can talk to your friends or penpals on the internet if you have an e-mail address.
Two of the most popular places to get a free e-mail address are sites like Yahoo and Hotmail. If you don't have a computer at home, you can email from school or from internet cafes.
And you can email us at firstname.lastname@example.org.