The importance of learning in all facets of our lives, and our experience with the world around us, can be seen as the participation in an interconnected series of learning environments. Regardless of our location on the planet, and the cultural and language spaces in which we work and live, computers and technological innovations influence our lives to a greater extent all the time. This Handbook is about VLEbs, and it includes both types, digital and virtual, in order to describe the wide landscape of possibilities for discussing, conceptualizing, creating and inquiring into Virtual Learning Environments.