What is it?

Massive

Unlimited participants; 160,000 enrolled in a 2012 course
Open
Free, not limited by geography, accessible, no prerequisites, content is shared
Online
Internet based; may also work with mobile technology
Course
learning is involved, but grading and other traditional expectations are usually NOT







Additional Resources:


"Massive Open Online Course" from Wikipedia

George Siemens on MOOCs a lengthier explanation on YouTube