What chain is BGB built on?

Could you please elaborate on the blockchain technology that underlies the construction of BGB? I'm particularly interested in understanding the specific chain it's built upon. Could you also explain the reasons for choosing this particular blockchain? Is it due to its scalability, security features, or perhaps its compatibility with other financial systems? Additionally, how does this choice impact the overall functionality and performance of BGB? I'm eager to gain a deeper understanding of this aspect of BGB's architecture. Thank you for your assistance.