Cardano addresses Sybil attacks, a type of attack where a single entity controls multiple identities or nodes on a network to manipulate consensus or disrupt operations, through its Proof of Stake (PoS) consensus mechanism and delegation model. By requiring stakeholders to hold and "stake" ADA as collateral to participate in block production and validation, Cardano disincentivizes Sybil attacks and ensures that the majority of stakeholders have a vested interest in the security and integrity of the network. Additionally, Cardano's delegation mechanism encourages decentralization and discourages concentration of power among a small number of entities, further mitigating the risk of Sybil attacks.