Email is like sending a letter, only you send the message over the internet and it gets to the other person's email account within seconds.
If you have an email address,you can email anyone else who has an email address, including government agencies and lots of different kinds of businesses.
You'll create one or more email addresses when you open a new email account. Just like website addresses, every email address must be unique. So, when you create a new email account, you'll have to pick email addresses that haven't already been chosen by someone else.