A MOOC is a massive open online course that provides learning content online to any person who wants to take the course. Key aspects of a MOOC include large numbers of students, open access from any location, and online course delivery. MOOCs originated in the early 2000s and have grown significantly since then. They can benefit educational institutions by providing data to improve teaching practices and expanding access to learning opportunities. While MOOCs offer advantages like open participation, challenges also exist like helping all learners master the content.