MOOC stands for Massive Open Online Course, perhaps you have heard about websites such as Coursera or Edx or Udacity; if you haven't you are missing out. Depending on your career level, MOOC's provide training and free courses from top Universities such as Harvard (Edx) and MIT. Many universities have taken advantage of free education (open source ware) as a means of serving their students better. These websites offer advanced courses for those who already have a background in certain fields such as computer science, Biology, Engineering and social sciences. But they also have beginning courses with no prerequisites what so ever.
The classes operate like regular online courses with video lessons from professors and extensive reading assignments. It is worth taking a course if you are looking to improve your skills or perhaps thinking of changing fields and would like to see if that field would actually be of interest.It's worth seeing if you are interested before you spend thousands of dollars in training in a traditional program. MOOC's will most likely not replace traditional courseware in universities, but do offer the opportunity to advance your knowledge.
Most classes provide meet-ups where students across the country can meet with one another to discuss their respective subjects. If you are really interested in using the information to advance your job status you can opt in for a signature track. Do you research on each site to see if you are able to able a credit or certificate that you can possibly add to your resume.
If you are not interested in a rigorous course,(most MOOC's are quite extensive and on the similar level and workload as a regular ivy league course) you might consider other options. Alison and other online training modules such as Lynda.com provide training in fields which maybe require simply a certification. Some programs such as Alison.com allows more freedom to take the class at your own pace and also there is not grade.
Be sure when deciding on which programs to check out the website blogs, many times which feature success stories of students who have completed training and gone on to obtain jobs in their field. Online learning is not for everyone but it definately might be worth your time. As always happy job hunting.