Bitcoin Cash (BCC) / BCH is a hard forked version of the original Bitcoin.
It is similar to Bitcoin in terms of it's protocol. SHA-256 hashing and the maximum rate of BCH is 21,000,000. In addition, BCH uses the same block times as BTC and also the same reward system for the miners.
There are two main differences:
The block size limits and the difficulty
Bitcoin has a block limit of 1 MB since August 2017, while (BCC) / BCH proposes 8 MB blocks. (BCC) / BCH adjusts the difficulty level every 6 blocks, unlike 2016 blocks like Bitcoin. Bitcoin Cash is an offer from the BTC mining pool and the Bitmain Mining Group to conduct a User Activated Hard Fork (UAHF) on August 1, 12:20 pm UTC. They rejected the agreed consensus (also known as BIP-91 or SegWit2x) and decided to fork the original Bitcoin blockchain and create this new version called Bitcoin Cash. Bitcoin Cash can be stored by BTC owners who have their Private Keys or Bitcoins in a service that distributes the customer (BCC) / BCH.