A domain is like the address of your house, but for your website. It's the specific web address that people type into their internet browser to visit your website. For example, in 'www.example.com,' 'example.com' is the domain. It usually consists of a website name, which you can choose (like 'example'), and a domain extension (like '.com', '.org', '.net', etc.). Just like every house address is unique, each domain is unique so that when someone types it in, they're taken directly to your website and not someone else's. It's how people find you in the vast world of the internet. When you set up a website, choosing and registering a domain is an important step, as it gives your website its own identity and makes it easy for people to find it.