Simply put, Bitcoin Cash (BCH) is a cryptocurrency, that came from Bitcoin (BTC). It is not the same currency and its technical implementation differs. However, like pizzas that can be served as dessert pizzas or savoury pizzas, they come from the same base.
Bitcoin Cash was launched in August 2017 as a result of a hard fork of the original Bitcoin blockchain. The main motive of the fork was to increase the block size in the blockchain from 1MB to 8MB (then to 32MB) to facilitate faster transactions. This is often regarded by the Bitcoin Cash community as a faster and cheaper system alternative to Bitcoin (BTC) - but the debate remains.
These aren’t all the differences between the two cryptocurrencies especially as developers continue to evolve their technology to encompass other areas beyond just the speed. Like a lot of cryptocurrencies or altcoins on the market, both communities are passionate and there are plenty of innovative projects bringing us closer to the digital financial future that we deserve.