Q: What happens in a trial?

In a trial, the prosecutor presents the case for the state and has the burden of proving beyond a reasonable doubt that the defendant committed the crime. The defendant may present evidence, but is not required to do so. Nor may anyone force the defendant to testify. The trial can be held in front of a jury or a judge. (A trial in front of a judge without a jury is called a "bench" trial.) Whether it is a jury trial or a bench trial is up to the defense.