The IB uses a concept-driven curriculum in all of its programmes. Concept based learning is about big transferable ideas that transcend time, place, situation. While content focuses on facts, concepts focus on making sense of those facts and the world around us.
According to Lynn Erickson, Conceptual learning:
connects new information with what students already know and understand.
bridges disciplines and subjects to support deeper knowledge of topics and ideas.
sharpens metacognitive abilities for students and facilitates higher order thinking.
draws students into immersive learning experiences with multiple starting points.
rewards multiple ways of thinking, learning and expression.
You can learn more about concept-driven learning from this video: What is Concept Based Learning?