This document provides an overview of challenge-based learning (CBL). It defines CBL as a collaborative learning experience where students work with teachers to learn about real issues, propose solutions, and take action. The document discusses how CBL taps into student curiosity, focuses on authentic global challenges with local solutions, and allows students to hone 21st century skills. Examples of CBL challenges are provided, as well as guidance on implementing the CBL framework and using digital tools to support CBL in the classroom.