Bitcoin Cash is a Bitcoin hard-fork that took place on the 1st of August, 2017. The fork was initiated because of the opinion that clissic Bitcoin has scalability issues.
Bitcoin Cash changed the size of the blocks from 1MB to 8MB, making it possible to process around 60 transactions per second, compared to the 7 transactions per second of the classic Bitcoin, including the SegWit update.
It also has lower transaction fees, compared to Bitcoin.
In addition, Bitcoin Cash didn’t integrate the Segregated Witnesses (SegWit) protocol, it has stronger protection against replay attacks, and the difficulty of the block mining is adjusted faster than with Bitcoin.
One main problem with Bitcoin Cash is that the increased block size makes it difficult for smaller miners (computers) to contribute, because they are not able to process this amount of data. The size of Bitcoin Cash’s block sizes are 8MB compared to Bitcoin's 1MB and both have 10 minute block times, so every 10 minutes there is eight times more information saved on Bitcoin Cash's blockchain, making it faster than the traditional Bitcoin blockchain. This could mean over 1GB of new data every day.