This document defines and discusses Massive Open Online Courses (MOOCs). It explains that MOOCs aim to provide online courses to unlimited participants worldwide. The document outlines the key characteristics of MOOCs, including their massive scale, open access, and online format. It also discusses the advantages and disadvantages of MOOCs, and different types of MOOCs including cMOOCs, sMOOCs, and xMOOCs. Finally, the document describes a specific MOOC on emerging technologies that the author would like to take.