CS50 is an introductory computer science course offered by Harvard University. It covers fundamental concepts such as algorithms, data structures, software development, and web programming. The course is designed for students with no prior programming experience and emphasizes problem-solving and critical thinking skills. The course is available for free online through platforms like edX and Harvard's online learning portal. It includes lectures, problem sets, and a final project, allowing students to apply what they've learned. CS50 has gained popularity for its engaging teaching style and supportive community, making computer science accessible to a wide audience.