What is a validator?
A blockchain validator is someone who is responsible for verifying transactions on a blockchain. In proof of stake (PoS) systems like Avalanche®, validators are given rewards as long as they stake the network’s token (AVAX) and correctly participate in the network. This mechanism helps secure the network by imposing the need to lock up value in the network in order to participate in the consensus decisions.
To learn more about Avalanche validators, please read the following article.