What is the difference between BTC and BSC?

I'm curious to understand the key differences between Bitcoin (BTC) and Binance Smart Chain (BSC). Could you elaborate on the distinct features and purposes of each platform? How do they differ in terms of their technology, transaction speed, cost, and the types of projects they support? Additionally, how do their security measures and decentralization levels compare? I'm eager to gain a clearer picture of the advantages and limitations of each blockchain network.