Peer instruction is an active learning strategy that exploits peer learning in the classroom. It involves instructors creating carefully designed multiple choice questions for students to answer individually and then discuss in small groups in order to reach a consensus answer. Peer instruction is implemented in various ways including clicker systems, flashcards, and online platforms. The key aspects of effective peer instruction questions are that they address common misconceptions, can be answered in a short time period, and have a clear correct answer that can be agreed upon.