ERC-1155 is a token standard on Ethereum that allows a single smart contract to manage multiple types of tokens at once. These tokens can be fungible (like regular currencies or game items) or non-fungible (unique assets like NFTs). Unlike older standards like ERC-20 or ERC-721, which handle only one token type per contract, ERC-1155 can handle many tokens efficiently, reducing costs and complexity. It’s widely used in gaming, marketplaces, and applications needing both unique and identical tokens.