Domain

A Domain is a website name, and it's very cheap to make a new one.  It's around $10 a year for a new one, if you are buying an existing popular domain name, it could cost up to thousands of dollars.  A Domain name should be catchy and easy to remember so people will want to go to your website, and also you'll want to make it easy to remember, so then they can remember where to go! Such as Google or Facebook, those are common names and easy to remember.