Jury instructions are guidelines provided by a judge to a jury before they begin deliberations in a trial. These instructions explain the legal standards that must be applied to the case, including definitions of relevant laws and the burden of proof. They help jurors understand their responsibilities and the criteria they should use to reach a verdict. The purpose of jury instructions is to ensure that jurors make decisions based on the law and the evidence presented during the trial. Clear and accurate instructions are crucial for a fair trial, as they help jurors avoid personal biases and focus on the facts of the case.