Aptos Network uses a unique consensus mechanism called Proof of Authority (PoA) to validate transactions. Unlike Proof of Work (PoW) or Proof of Stake (PoS) mechanisms, PoA relies on a small group of validators to confirm transactions, making it faster and more efficient. The validators are selected based on their reputation and expertise, ensuring that the network is highly secure and reliable. With its PoA consensus mechanism, Aptos Network can process thousands of transactions per second, making it one of the fastest blockchain networks in the world.