Khan Academy

Khan Academy is a non-profit educational organisation that offers free online lessons in mathematics, science, computing, history, economics, reading and more. Its mission is to provide a free, world-class education for anyone, anywhere, and it is used by many millions of learners, teachers and parents around the world. It began when Sal Khan recorded short video lessons to tutor his cousins in maths, posted them on YouTube, and found that many other people were learning from them. Those simple, conversational videos - a voice explaining concepts while writing on a digital blackboard - became the foundation of Khan Academy, which grew into a full learning platform supported by philanthropy rather than fees or advertising. The platform's approach is mastery learning. Courses are broken into skills with practice exercises that adapt to each learner, who progresses after demonstrating understanding rather than simply moving on when a unit ends. Coverage spans from early maths through calculus, statistics, physics, chemistry, biology, computer programming, grammar and test preparation, with content aligned to school curricula in several countries. Teachers can assign content and track their class's progress, and districts use it at scale. Khan Academy Kids serves young children with free educational games and stories. Khanmigo is Khan Academy's AI-powered tutor and teaching assistant. Rather than simply giving answers, it is designed to guide students through problems with questions and hints, and it helps teachers plan lessons and create materials. Khanmigo access for teachers has been offered free in many places, while learner access has had different terms by region. The limitations are those of self-paced online learning: it works best with motivation and support from parents or teachers, and depth in advanced or specialised subjects is more limited than university courses. Alternatives include IXL and Brilliant for interactive practice; Coursera and edX for university-level courses; Duolingo for language learning; Outschool for live classes for children; and CK-12 for free curriculum materials. Choose Khan Academy when you want free, high-quality learning and practice, especially in maths and science.