Greetings.

the PoW consensus algorithm was used in which the governance and maintenance of the blockchain is in the hands of the miners who are actually those that verify the transactions by solving the complex mathematical calculations.

PoW requires a large amount of energy from miners to participate in the validation of its transactions as they employ the use of supercomputers to solve cryptographical puzzles to earn the right of validating a transaction. Whereas DPoS as a delegate system requires a very much less as it is a consensus that allows witnesses and delegates voted for to carry out the validation process. More like a Democratic system.

Best of Luck my friend.