MOOCs are free online courses that are open to anyone. They do not have entry requirements or formal credits but provide statements of accomplishment. The first MOOC was created in 2008 by educators Stephen Downes and George Siemens and was called 'Connectivism and Connective Knowledge'. It had over 2,200 students. While MOOCs increase access to education, some are concerned they could replace traditional classrooms and liberal arts education. Others worry they may not remain truly free long-term. Overall, MOOCs present both opportunities and challenges for rethinking online education.