Email has become the premier way to communicate in the computer era. If you're not hooked up to email, you may never hear from anyone you know. Email is a little more complicated than sending a letter in the mail, but it's the same idea....
If your email is through an online provider, such as yahoo, msn, etc, then you will have to log in to your account. Once you are logged in, you simply click the envelope icon. Then go to your inbox.