What is BNB good for?

I've heard a lot about BNB, but I'm still not quite sure what its actual uses are. Could you please explain to me, in a nutshell, what BNB is good for? I'm particularly interested in understanding its role in the crypto ecosystem and how it benefits users. Is it just a trading token or does it have more functionalities? I'd appreciate it if you could break it down for me in a way that's easy to understand. Thanks in advance for your help!