Axies are digital creatures that players can collect, breed, and battle in the blockchain-based game called Axie Infinity. Each Axie has unique traits and abilities, represented by different body parts and characteristics, which influence their performance in battles. Players can earn rewards by participating in battles and completing quests with their Axies. The game operates on the Ethereum blockchain, allowing players to truly own their Axies as non-fungible tokens (NFTs). This ownership enables players to trade or sell their Axies in various online marketplaces.