What exactly is the difference between Free Will and Predestination/Determinism? Is the concept of Free Will still useful even if Predestination/Determinism is true?

First of all, I'm aware Free Will is a highly debated topic. In this post I'm just asking to clarify the difference between Free Will, Predestination, and Determinism.<br><br>To me, Free Will is defined as every individual having control over their choices.<br><br>Predestination is defined as the concept that every decision we make is already given to us by God. <br><br>Finally, Determinism is the same as Predestination except that it's controlled by science and random events throughout history. <br><br>I also know that there are different variations of Free Will, Predestination, and Determinism. My main question is, even if Predestination/Determinism is true, does that necessarily eliminate Free Will? Is the concept of Free Will still useful in such a scenario? Or am I just missing something important?