The Rules of Rebuy and Zakat

Most people's intention is to simply protect their money. It's not as an investment, right? Because most people don't understand the way banks work. So in that sense, when I put my money there, if we were to say, okay, well, this cash is similar to some other good that I might leave with you, then the bank should have the ability to utilize it, right? When they're supposed to simply be protected it. But can I consider that interest that's paid to me by the conventional bank for leaving my money in the account profit? This is where it becomes confusing.