Bitcoin Cash (BCH) is a peer to peer electronic cash system. This means that payments can be sent directly from one party to another without going through a bank or third party. Peer to peer implies that either side can initiate a session and has equal responsibility.
Website: bitcoincash.org
A Blockchain is an ongoing chain of hash-based proof-of-work.
Wikipedia: Blockchain
A Cryptocurrency is a distributed network and online payment system using a blockchain and strong encryption.
Wikipedia: Cryptocurrency
A URI Scheme identifies a resource on the internet. There are URI Schemes for Bitcoin Cash and Simple Ledger Protocol allowing for clickable payment links and payment handling in QR codes and other applications.
Wikipedia: Uniform Resource Identifier