What is FTX and why did it crash?

Could you explain what FTX is and why it suddenly collapsed?" I'm a bit puzzled about this recent event in the cryptocurrency world. As a layman, I've heard a lot about FTX being a major player in the crypto industry, but I don't quite understand its inner workings or what led to its downfall. Could you break it down for me in a way that's easy to understand? I'm particularly interested in knowing if there were any specific factors or decisions that contributed to its collapse, and what lessons can be learned from this incident for other crypto companies.