MITx is MIT’s online learning initiative for offering Massive Open Online Courses (MOOCs), MicroMasters programs, and other digital learning experiences. These courses have been hosted on various platforms, including edX.org, MITx Online, and now MIT Learn.
With the introduction of MIT Learn and its absorption of the MITx Online learning platform, many MITx courses are now being offered exclusively on this MIT Learn / MITx Online Learning Platform.
For more information, continue reading in the FAQ article What types of courses and programs does MITx offer?