Wrapped token
In short A wrapped token is a token issued against another asset, usually 1:1, so that asset can be used in a different format or on a different blockchain.
A wrapped token is a token that represents another asset and is issued against it, normally at a 1:1 ratio. The original is locked or held in custody, and the wrapped version stands in for it where it can actually be used. Sometimes that is the same chain, as with WETH on Ethereum, and sometimes it is a different chain, as with WBTC, which represents Bitcoin on Ethereum.
Mechanically, the original asset is deposited into a smart contract or with a custodian, and the matching amount of the wrapped token is minted. Redeeming reverses the process: the wrapped token is burned and the original is released. WETH is the simplest case. ETH does not follow the ERC-20 interface, so apps and pools built around that interface cannot handle it directly, and a contract takes your ETH and mints WETH, which does follow it. WBTC is custodial: minting and redemption typically go through approved merchants and a custodian's procedures, not through any holder depositing and burning at will. Most people simply buy and sell it on markets. Cross-chain wrapped tokens generally rely on a bridge that holds the original on the source chain.
This matters because it lets value and liquidity move between ecosystems and standards. Bitcoin can be used in Ethereum DeFi, and a coin from one chain can be traded on another. Most liquidity pools also pair against the wrapped version of a chain's native coin, such as WBNB or WETH, so you are often trading the wrapped token even when your wallet only shows BNB or ETH. Swap interfaces usually wrap and unwrap for you automatically.
The risk is that a wrapped token is only as good as whatever backs it. If a custodian fails, or a bridge contract is exploited and its reserves are drained, the wrapped tokens left in circulation can trade well below the asset they claim to represent. Several large bridge hacks have played out exactly this way. Some chains also carry multiple versions of the same asset, for example USDC arriving through different bridges, each with its own backing, risk, and liquidity.
Before buying or holding one, find out who issues it and how the backing is held. Check whether the reserves can be verified, and look at how deep the liquidity is. Confirm the contract address from an official source and on a block explorer, because anyone can deploy a token named "Wrapped Something" with nothing behind it.