A massive open online course (MOOC) is an online course designed for unlimited participation and open access via the internet. MOOCs typically offer free access to course materials, including video lectures, readings, quizzes, and discussion forums. They are often offered by universities and other educational institutions, and cover a wide range of topics and disciplines. MOOCs have become increasingly popular in recent years, as they provide opportunities for lifelong learning and professional development to anyone with an internet connection.