Bitcoin Cash is a fork of the original Bitcoin blockchain with some changes and additional features.
With a new name to Bitcoin’s offspring, i.e. Bitcoin Cash, it seems to appeal to a stratum of users who believe that Bitcoin should be a cash-like thing that’s easy to exchange with minimal or no fees. Suffixing ‘Cash’ to Bitcoin encourages this usage.
In addition, Bitcoin cash increased its block size limit in order to increase the maximum amount of transactions that can be processed by the system in 24 hours. A certain group of users, miners, and developers have always advocated for a bigger block size in BTC. Now with Bitcoin Cash, they have increased the block size limit from 1MB to 8MB. Thus, enabling Bitcoin Cash to process around 2 million transaction per day, compared to 250,000 Bitcoin transactions per day.