Binance Smart Chain (BSC) is a blockchain network for moving BEP-20 tokens. On Cryptal, you can select BSC to deposit or withdraw BNB or USDT. Using BSC will result in a faster transaction confirmation and lower transaction fee.
Simply select Binance Smart Chain:
Note that you can only transfer to and from the same network. If the wallet you are transferring to doesn't support BSC (BEP-20) your withdrawal will not work. Similarly, you cannot receive ERC-20 coins using a BEP-20 address.