Is BTCB the same as BTC?

Could you please clarify, is BTCB synonymous with BTC? I've been hearing these two terms used interchangeably, but I'm not entirely sure if they refer to the same thing. I understand that both are related to the cryptocurrency world, but there might be some fundamental differences that I'm not aware of. For instance, are they both based on the same blockchain technology? Or do they serve different purposes within the crypto ecosystem? It would be helpful if you could break it down for me in layman's terms. Thanks in advance for your assistance!