Welcome
Introduction to the intellectual enterprises of computer science and the art of programming. This course teaches students how to think algorithmically and solve problems efficiently. Topics include abstraction, algorithms, data structures, encapsulation, resource management, security, software engineering, and web programming. Languages include C, Python, and SQL plus HTML, CSS, and JavaScript. Problem sets inspired by the arts, humanities, social sciences, and sciences. Course culminates in a final project. Designed for concentrators and non-concentrators alike, with or without prior programming experience. Two thirds of CS50 students have never taken CS before. Among the overarching goals of this course are to inspire students to explore unfamiliar waters, without fear of failure, create an intensive, shared experience, accessible to all students, and build community among students.
Watch an introduction
How to Take this Course
Even if you are not a student at Harvard, you are welcome to “take” this course for free via this OpenCourseWare by working your way through the course’s eleven weeks of material. If you’d like to submit the course’s problem sets and final project for feedback, be sure to create an edX account, if you haven’t already. Ask questions along the way via any of the course’s communities!
- If interested in a verified certificate from edX, enroll at cs50.edx.org instead.
- If interested in a professional certificate from edX
- in web development, enroll at cs50.edx.org/programs/web instead.
- in artificial intelligence, enroll at cs50.edx.org/programs/ai instead.
- in game development, enroll at cs50.edx.org/programs/games instead.
- If interested in transfer credit and accreditation from Harvard Extension School, register at courses.extension.harvard.edu/course-catalog/courses/subject/CSCI/50 instead.
- If interested in transfer credit and accreditation from Harvard Summer School, register at courses.summer.harvard.edu/course-catalog/courses/subject/CSCI/50 instead.
How to Teach this Course
If you are a teacher, you are welcome to adopt or adapt these materials for your own course, per the license.