ZCash is a cryptocurrency with a decentralized blockchain that seeks to provide anonymity for its users and their transactions. As a digital currency, ZCash is similar to Bitcoin. Like Bitcoin, ZCash also has an including its open-source code, but their major differences lie in the level of privacy and fungibility that each provides.
Bitcoin was a pioneer in the open financial system; ZCash seeks to maintain the same structure as Bitcoing but with privacy and fungibility as added feature. Fungibility refers to the ease with which one commodity can be substituted for another. Money–whether it is gold or a fiat currency like the U.S. dollar–is fungible because you can trade it for anything else.