A criminal jury is a group of citizens selected to hear evidence in a criminal trial and determine the guilt or innocence of the accused. Typically, a criminal jury consists of twelve members, although some jurisdictions may allow for smaller juries. Their primary role is to evaluate the facts presented by both the prosecution and the defense, ensuring a fair trial as guaranteed by the Sixth Amendment of the U.S. Constitution. During the trial, jurors listen to witness testimonies, review evidence, and follow the judge's instructions on the law. After deliberation, they reach a verdict, which must usually be unanimous in serious criminal cases. If the jury finds the defendant guilty, the judge will then impose a sentence, while a not guilty verdict results in the defendant's acquittal.