All Ethereum based transfers are processed by a smart contract. So when you initiate your transfer, you have to increase the gas limit from the default 21,000 to 52,000 or the transaction won't have enough gas to execute the smart contract, and your transaction will run out of gas, resulting in a failed transaction.
Any unused gas after executing the contract will be returned to your balance.
Note: 'Gas' is the fee that miners charge to process transactions on the blockchain