This document discusses definitions and dimensions of e-learning. It notes that there is no commonly accepted definition, but e-learning generally involves using digital technologies for learning beyond what a single computer can offer. It explores four broad dimensions of e-learning and discusses whether e-learning involves independent use, interaction, formal/informal learning, and synchronous vs asynchronous engagement. The document also addresses some myths and realities of e-learning, such as assumptions around availability, use of multimedia, accommodation of learning styles, and cost savings.