Khan Academy is a non-profit educational organization that provides free online courses and resources, while Coursera, Udacity, and edX are all online learning platforms that offer paid courses and programs.

Online learning platforms offer flexibility, affordability, and accessibility, making them a great option for learners of all ages and backgrounds.

Online learning can be challenging due to the lack of face-to-face interaction, technical difficulties, and difficulty staying motivated.

Social learning platforms are not typically considered to be online learning platforms, as they do not offer formal courses or programs.

MOOCs are open to anyone, self-paced, and offer a variety of courses, while VLEs are only open to enrolled students, instructor-led, and typically offer a limited number of courses.

An LMS is used to deliver course content to students, track student progress, and facilitate communication between students and instructors.

LMSs can improve organization and efficiency, increase student engagement, and improve communication between students and instructors.

LMSs can be expensive, complex, and require technical support, which can be a challenge for some organizations.

Online learning is expected to become more personalized, accessible, and affordable in the future.

Online learning platforms can be used to improve education in developing countries by providing access to quality education for students in remote areas, reducing the cost of education, and improving the quality of teaching.