Peer Assisted Learning (PAL) involves students helping each other learn and teach course material. There are four main types of PAL: same-level peer tutoring with equal or unequal status between students, and cross-level tutoring within or between institutions. PAL is commonly used in higher education, particularly for courses with many international students, technical content, or collaborative work. PAL provides benefits but requires clear responsibilities for tutors and students, working in small groups, and being properly integrated into course curriculum.