MOOC: Massive Online Open Course

The Massive Open Online course (MOOC) is an emerging method of online teaching whose application in education is just emerging. The successful implementation of MOOC requires conceptual changes in understanding by teachers and students. 

The massive refers to the number of students- usually in thousands. The Open reference to open-source, registration is open to anyone, and curriculum is open ( or loosely structured, and course sources are open and assessment process and procedure is also open. One example is Venture Lab run by Stanford University 

Reference: A BriefGuide to Understanding MOOCs