Zcash is based on peer-reviewed cryptographic research, and built by a security-specialized engineering team on an open source platform based on Bitcoin Core's battle-tested codebase. Our improvement over Bitcoin is the addition of privacy. Zcash uses advanced cryptographic techniques, namely zero-knowledge proofs, to guarantee the validity of transactions without revealing additional information about them.
ZCash is a new member in "personal transaction"section.
It is interesting that some technologies of ZCash are deployed by Ethereum, helping the Ethereum transactions stay secret.