Email is another way of communicating in the Internet. It stands for electronic mail, and that's correct, it's like mail, but in the computer! Sometimes you get spam, in forums
you get updates from them. You can write messages to each other in email.
Email is kinda like forum
s, except there is nobody to use the ban hammer
on you or your friend, but you have to wait and there's nobody stopping you from posting porn, sending viruses, and posting spam.
Email is usually the best way of contacting somebody, since you do not pay to send an email or get an email, except for electricity bills.