Proof of Work 101 summary.
Proof of Work 101 is the original consensus algorithm. It performs with a miner or a group of miners that has to solve a computational equation. This is the only way to find a block on the blockchain network.
A block is rewarded to the first miner who solves the puzzle. Whilst proof of Work is not an efficient solution. It is still one of the most popular methods of reaching consensus.
Finding blocks on the blockchain using Proof of Work, increases energy use as the network scales. The community can also lean towards being centralised.