Book excerpt: The third edition of E-Learning in the 21st Century provides a coherent, comprehensive, and empirically-based framework for understanding e-learning in higher education. Garrison draws on his decades of experience and extensive research in the field to explore technological, pedagogical, and organizational implications. The third edition has been fully updated throughout and includes new material on learning technologies, MOOCs, blended learning, leadership, and the importance and role of social connections in thinking and learning, highlighting the transformative and disruptive impact that e-learning has recently had on education.