An "Exit Ticket" is a quick assessment tool used by educators to gauge students' understanding of a lesson before they leave the classroom. Typically, students respond to a prompt or question on a small piece of paper, which helps teachers identify areas that may need further review or clarification. This method encourages student reflection and provides immediate feedback for instructors. By analyzing the responses, teachers can adjust their future lessons to better meet the needs of their students, ultimately enhancing the learning experience in the classroom.