Moocs the virtual classroom

What are moocs, or massive online open courses.Its already being called revolutionary and only a few years old. I recently tried an online course on udacity.com . which is from a professor from stanford university created his own online classroom. I advise you check one out they have many different course u might be interested in.I wanted to see what they were all about since wew will be writing an essay on them .Somthing we no nothong about will be difficult to talk about with out having credible knowledge , along with some first hand expeirence should be helpful for us.I signed up for a mooc  it was free and easy to sign up for . I did infact learn a few things already .The instructor went really slow and very easy to follow along with..Iwill look into this more so far i found moocs to be a very complex subject i have yet to decide if im on board with this new virtual classroom.