I think OP is asking whether Binance (or any other exchange) is creating the coins that are put into your account once you buy them--and no, that isn't the case.  Because that bitcoin that you bought is recorded on the blockchain, there's no way for Binance to just create it out of thin air.  Some other customer deposited bitcoin and was looking to sell it for cash, and when you buy it for cash, the order is filled (and Binance takes a cut of course).

Props to you and your answer.  There are a lot of members here who just don't understand the basics of markets, exchanges, and all that--but they'll learn about that stuff if they do any trading (and reading posts here, too).