0xdd62ed3e?0xdd62ed3e is the function selector for allowance(address,address). Reads an existing allowance. Read-only.
When a transaction's data begins with 0xdd62ed3e, it is calling allowance. The selector is the first four bytes of the keccak-256 hash of the signature allowance(address,address), which is how wallets and explorers work out which function a payload is for.