token standard

A token standard is an agreed set of rules that a smart contract follows so that a token it creates behaves in a familiar, predictable way. A token here is simply an asset, a coin, a share, a collectible, that lives as an entry inside a contract on the blockchain. Without a common standard, every token would have its own quirks, and every wallet and exchange would need custom code to handle each one. A standard fixes that, much like a standardized power socket: any plug built to the same shape just works, no matter who made the appliance.

Concretely, a standard spells out the exact set of functions a token contract must offer and what each one does, for example a way to check someone's balance, a way to transfer tokens, and a way to authorize another contract to move tokens on your behalf. Because the names and behaviors are fixed, a wallet, marketplace, or other app can support any token built to that standard without knowing anything special about it in advance. The token's own contract still holds the real balances and rules; the standard just guarantees a common, public way to talk to it.

Token standards matter because they are the reason a single wallet can hold thousands of different tokens, and an exchange can list a new one within minutes. They turn tokens into interchangeable building blocks that snap neatly into the wider ecosystem. Different standards exist for different needs, notably ones for interchangeable units like a currency and ones for unique, one-of-a-kind items, each defining its own shared interface.