Bitcoin has given rise to a few other currencies and one of those hard-forked alternatives is Bitcoin Cash (BCH). In terms of similarities, they share the same hashing algorithm, SHA-256. Supply is similarly capped at 21 million, and they also share the same reward system and block times. But there are a couple of differences. The blocksize limit of Bitcoin is 1MB (at Aug 2017) while BCH can accommodate 8MB blocks. Bitcoin Cash will also alter the difficulty every 6 blocks whereas Bitcoin waits until every 2016 blocks to do so.
The Bitmain mining group and the viaBTC mining pool were in favor of a User Activated Hard Fork (UAHF) called SegWit2x to create Bitcoin Cash, and this happened in August 2017. They did not agree with the rules governing Bitcoin and so decided to fork the original Bitcoin blockchain to initialize this new version called, “Bitcoin Cash”. BTC owners can claim Bitcoin Cash if they store their Bitcoins on a service that will split BCH for customers or if they have their private keys.