Allowance
The amount an ERC-20 token owner has authorized a particular spender to transfer.
In more detail
The token contract records an allowance for an owner-spender pair. The spender can use transferFrom within that allowance and the contract's rules without a fresh owner signature each time. It is a spending limit, not an app deposit or permission over every token in the wallet.
How you might use it
"There are 500 tokens in my wallet, but this spender's allowance is 50. It doesn't get the other 450 through that permission."
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