An Open-Book Exam is a type of assessment where students are allowed to refer to their textbooks, notes, and other resources while answering questions. This format is designed to test a student's understanding and ability to apply knowledge rather than just memorizing facts. In an open-book exam, students may encounter questions that require critical thinking and problem-solving skills. The goal is to encourage deeper learning and comprehension of the material, as students can look up information to support their answers. This approach is often used in subjects like mathematics, science, and social studies.