PROOF-OF-WORK
A consensus mechanism where certain members of the network, known as miners, have to perform certain tasks to run and maintain the blockchain network. When new blocks are created, they must be hashed and miners in the network race to solve cryptographic problems for the chance to create the new block and gain the block rewards.
Ethereum's Vitalik Buterin Concerned About Security Risks That Come With High ETH Transaction Fees
By now, it is no secret that Ethereum co-founder Vitalik Buterin and his team are busy perfecting Ethereum 2.0 and preparing it for its official launch.