Dash:
Dash comes from Digital Cash. It's an open source cryptocurrency like as bitcoin. Dash payments system in similar of bitcoin. It's transaction instant send without centralized authority.
At first, Xcoin released in 14 January, 2014. Then, it's name has changed Xcoin to Darkcoin, Then it's name changed Darkcoin to Digital Cash. Dash investor is Evan Duffield, he is improved bitcoin protocol. Two types network in dash - Masternodes & Miners.
In March 2017, Dash revenue growth $574000 per months.
See More:
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Cryptocurrency definition & its mining process
Zcash Cryptocurrency Invention Details