This document provides an explanation of problem-based learning (PBL), which is a teaching method that uses problems as a starting point for students to acquire and integrate new knowledge. PBL involves giving student teams a well-structured problem to work through with guidance from a facilitator. The process involves exploring the problem, identifying what is already known and unknown, and determining what needs to be learned to solve the problem. Examples of PBL are provided, as well as citations for additional resources on PBL and collaborative learning approaches.