So, imagine you live in a big country and people speak different languages in different parts of the country. Now, let's say you live in a small region of that country where the people speak a language that is a bit different from the language spoken in other parts of the country. This small region is called Campidano and the language spoken there is called the Campidanese Dialect.
It's kind of like how your friend from a different state might say some words differently than you do, but you can still understand each other. The Campidanese Dialect has some words that are different from other Italian dialects, and sometimes they might sound a little funny to people who speak a different dialect.
But just like how you can still talk to your friend from a different state, people who speak the Campidanese Dialect can still talk to people who speak other dialects or even standard Italian. It's just a unique and special way of speaking for the people who live in Campidano.