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Websites are made up of a domain (for example, **wikipedia.org**) and then pages, which are contained within the domain. The pages can in turn contain other pages and so on.

To tell the search engine and the browser how to reach them, an address is used that tells them which page to fish for the content. That address is called URL and is written in a particular way to be readable without problems by browsers.

For example, the Wikipedia page that talks about the European Cat is here:

**https://it.wikipedia.org/wiki/Gatto_europeo**

The domain is: it.wikipedia.org while the folder that contains the page Gatto_europeo is called wiki. URLs use slashes / and hyphens - to avoid using spaces and other characters that browsers read badly.