E-learning refers to learning facilitated through electronic technologies and digital media. It began emerging in 1999 with terms like online learning and virtual learning. E-learning can take various forms like distance learning, web-based training, computer-based training, and internet-based training. It has advantages like flexibility of schedule and reduced costs, but disadvantages like reduced social interaction and potential lack of motivation without an instructor. E-learning materials can be distributed online or offline and aim to develop competencies through independent learning regardless of time and place.