What Is the Difference between a 51% Attack and a Sybil Attack?

A 51% attack and a Sybil attack are both security threats to a blockchain network, but they operate differently. A 51% attack involves gaining control of the majority of the network's mining power to manipulate the blockchain.

A Sybil attack, on the other hand, involves creating a large number of fake identities or nodes to gain disproportionate influence over the network. While a 51% attack targets the consensus mechanism, a Sybil attack targets the network's reputation system or peer-to-peer network layer.