Consensus Algorithm:
Dash uses the X11 consensus algorithm, which is a proof-of-work algorithm that uses 11 different mathematical equations to secure the network and verify transactions. The X11 algorithm is more energy-efficient than the Bitcoin algorithm, and it allows for faster transaction times.
PrivateSend:
PrivateSend is a feature of Dash that allows users to send and receive Dash without revealing their identities. PrivateSend uses a technique called "ring signatures" to mix transactions with other users' transactions, making it difficult to track the origin and destination of the funds.