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Today's video tutorial discusses ERC20 permit, a mechanism allowing users to sign a message to approve spending of their tokens by another party. This process involves allowing a smart contract to authorize the spender for a specific value, which requires gas for approval and transaction fees. By signing a message and utilizing a relayer, users can give permissions to spend tokens without the need for multiple transactions. While ERC20 permit has not been finalized in EIP, it is already implemented in Open Zeppelin. Viewers are encouraged to like and subscribe to the channel before diving into the topic.