What is gas in Binance?

Could you please explain to me what gas is in the context of Binance? I'm a bit confused about the term and how it relates to cryptocurrency transactions on the platform. Is it a fee that's charged for each transaction? And if so, how is the amount of gas determined? Also, are there any ways to optimize my transactions to minimize the gas fees I have to pay? I'd really appreciate any clarification you can provide on this topic.