Brilliant is an online learning platform that focuses on teaching math, science, and computer science through interactive problem-solving. It offers courses designed for learners of all ages, from beginners to advanced students, using engaging visuals and hands-on activities to enhance understanding. The platform encourages users to think critically and develop their problem-solving skills. With a subscription model, users can access a wide range of topics, including algebra, physics, and data science, making it a valuable resource for anyone looking to improve their knowledge in these fields.