Is osmosis real?

Hello there, I'm curious to know if osmosis is a real phenomenon or just a theory. I've heard about it in biology class, but I'm wondering if it has any practical applications or if it's purely a concept used to explain how certain things work. Could you elaborate on what osmosis is, how it works, and if there are any real-world examples of it in action? I'm really interested to learn more about this fascinating process.