It's one of the most common words in the language and is used in a variety of contexts, such as:
* Asking a question: "Co robisz?" (What are you doing?)
* Expressing surprise: "Co?! To niemożliwe!" (What?! That's impossible!)
* Describing something: "Co to jest?" (What is this?)
* Introducing a topic: "Co chciałbym wam dzisiaj powiedzieć..." (What I would like to tell you today...)
It's a versatile word and plays a crucial role in Polish grammar and everyday conversations.