E-learning refers to electronically-supported learning and involves the delivery of educational content via the internet, intranets, audio or video tape, satellite broadcast, interactive TV, and CD-ROM. It encompasses a wide variety of applications and processes including web-based learning, computer-based learning, virtual classrooms, and digital collaboration. E-learning is used by organizations for reasons such as saving money, reaching geographically dispersed groups, and ensuring consistency. Effective e-learning requires sound instructional design and the use of technologies like learning management systems to deliver content and track learner progress. Emerging technologies being used to deliver e-learning include podcasting, vodcasting, wikis, and blogs.