Online learning, blended learning, flipped learning, hybrid learning, flexible learning, open learning and distance education are all terms that are often used inter-changeably, but there are significant differences in meaning. More importantly, these forms of education, once considered somewhat esoteric and out of the mainstream of conventional education, are increasingly taking on greater significance and in some cases becoming mainstream themselves. As teachers and instructors become more familiar and confident with online learning and new technologies, there will be more innovative methods developing all the time.