Catalan is a special language that people speak in some parts of Europe, especially in a place called Catalonia which is in Spain. It's kind of like how some people speak Spanish or French, but it's different because it has its own unique way of writing and speaking.
Imagine that you and your friends all speak English, but one day you decide to come up with your own secret way of talking. You still speak English, but you use some different words and sounds that only you and your friends understand. That's kind of like what Catalan is - it's a special way of communicating that people in certain parts of Europe have developed over a long time.
Some people might think it's strange or unusual to speak in a different way than most people do, but to those who grew up with Catalan, it's just a normal part of their everyday life. They might use it at home with their families or with friends, or even at work or school. It's like having your own secret language that only people who grew up speaking it can understand.
So, in summary, Catalan is a special language spoken in some parts of Europe, with its own unique way of writing and speaking that only those who grew up with it can fully understand.