Bitcoin Cash is one of the Bitcoin forks created in order to improve the adoption of Bitcoin. Bitcoin Cash gained a huge following and currently, it is one of the top 5 cryptocurrencies.
The idea behind Bitcoin Cash was to make it create a version of Bitcoin that would be a real mean of payment. Bitcoin Cash has bigger blocks of transactions so the transactions get validated much quicker.
However, there's still no dominant opinion on whether Bitcoin Cash is going to eclipse original Bitcoin.