Was sind Bitcoins und Wie funktionieren sie?

Could you please explain in simple terms what Bitcoins are and how they work? I've heard a lot about them but I'm still a bit confused about the concept. Are they like digital money that you can use to buy things online? And how do people actually get their hands on Bitcoins? Is it through mining or can you just buy them from someone else? I'm really curious to learn more about this fascinating world of cryptocurrency.