Bitcoin Cash is the result of a hard fork from the Bitcoin blockchain due to concerns about Bitcoin’s scalability in the Bitcoin community.
A hard fork is an event where a cryptocurrency splits or “forks out” into two or more incompatible versions as a result of competing changes to its technology.
The notable difference between Bitcoin and Bitcoin Cash is the block size. At the time of the split in 2017, the Bitcoin Cash block size was increased from 1 MB to 8 MB and currently stands at 32 MB allowing for significantly more transactions per second compared to Bitcoin while keeping fees extremely low.
Bitcoin Cash is the largest and most successful hard fork from Bitcoin to date.