Class Central is a search engine and review site for online courses. It catalogs offerings from Coursera, edX, FutureLearn, Udacity, and many university platforms, with filters for subject, level, language, and price. Reviews from learners help gauge quality before enrolling. The site also tracks free courses and audit options that many providers do not advertise prominently.

For self-directed learners who want to study a topic without paying for a degree, it is an efficient way to find structured courses. The annual "Best Online Courses" lists are widely shared. It is not a course provider itself, but a discovery layer that makes the fragmented online education landscape easier to navigate.