0x23b872dd?0x23b872dd is the function selector for transferFrom(address,address,uint256). Moves tokens from one address to another using an existing allowance.
When a transaction's data begins with 0x23b872dd, it is calling transferFrom. The selector is the first four bytes of the keccak-256 hash of the signature transferFrom(address,address,uint256), which is how wallets and explorers work out which function a payload is for.