This document discusses Massive Open Online Courses (MOOCs). It defines MOOCs as online courses that are open to unlimited participation and are conducted primarily through online platforms. The document outlines the history of MOOCs, which began in 2008 with a connectivist course attracting over 2,000 participants. It describes different types of MOOCs including cMOOCs based on connectivist learning theory and xMOOCs from institutions like edX focused on exploring new teaching models using technology. The document also discusses advantages and disadvantages of MOOCs for students and institutions.