There is only one Bitcoin and all other coins are termed as altcoins or hard fork of Bitcoin and similar thing happened in 2017 August when Bitcoin Cash was launched as hard fork of Bitcoin.It was proposed for faster transactions as block size of Bitcoin was 1Mb at that time and unconfirmed transactions in the memepool were increasing but most of the developer did not support it.It does not use any other Blockchain technology and Bitcoin cash also underwent hard fork in 2018 and split into BC and BSV(Bitcoin Satoshi vision) and using same POW concesus mechanism and moreover its supply is also capped to 21 million.They did not include SegWit into Bcash the other proposal by the developers.Most of the exchanges did not support Bitcoin cash at that time and so called Bitcoin Jesus Roger Ver became it's supporter for his personal benefits but still BTC remain at the top and developer are regularly working on making development for network improvement.So don't get confused between Bitcoin and any other altcoins in the market.