EdX, Coursera and Udacity are large-scale open online classroom platforms jointly established by MIT and Harvard University on April 5, 20 12. They are internationally recognized as three large-scale open online course platforms.

Massive open online course, referred to as "massive open online course", refers to a large-scale online open course, which is an online education mode that anyone can register and use for free. The education mode of massive open online courses was applied and promoted by the top universities in the United States in May 20 12. By establishing an online learning platform and offering free courses online, more students can be provided with opportunities to study in the domestic system.