Problem-based learning is a student-centered pedagogy where students learn through solving open-ended problems. It was developed in the 1960s based on John Dewey's idea that students learn best when actively engaged in real-world problems. In problem-based learning, students work in small collaborative groups under a tutor to seek solutions. It shifts the focus from teaching to learning, with teachers acting as facilitators rather than lecturers. The approach has been applied in various education fields to enhance critical thinking and self-directed learning.