A MOOC is a massive open online course that is open for anyone to take online anytime for free. The first MOOC was launched in 2008 by educators Stephen Downes and George Siemens and had over 2,200 students. In 2012, a Stanford course on artificial intelligence attracted over 160,000 students from around the world, demonstrating the massive potential of MOOCs. Since then, companies like Udacity, Coursera and edX were created to develop MOOC platforms, expanding access to education on a global scale. The document discusses the history and types of MOOCs.