Some words, like this sentence, are just plain text. Others jump from one document to another, and other will take you from one computer to another. When you use a link to jump, a record is kept of where you've been. This saves you going to the same places over and over again when you are searching for something. Here is a link that will jump from one point to another.
Email is a fast, cheap way of sending messages around the world.
The computer takes your message, decodes the address and sends it through the system. The type of organisation running the server the country in which the server operates Different countries have a different abbreviation for as the last two letters, so you can usually work out where in the world the address is. Note that there are no spaces in an email address. When you send email to a person who's name appears on a YarraNet page, the address is filled in for you. But to send mail to other people, you will need an email program.