What is BNB?

Could you please elaborate on what BNB is? I've heard it mentioned quite often in the cryptocurrency sphere, but I'm still a bit hazy on its specifics. Is it a type of coin? Or is it a platform for trading? I'm also curious about its origins and how it fits into the larger crypto ecosystem. Is it backed by a specific company or organization? And what are its main uses and benefits? I'd really appreciate a clear and concise explanation to help me better understand this intriguing aspect of the crypto world.