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Introduction to Computer Science

An introduction to the intellectual enterprises of computer science and the art of programming.

About this course

This is CS50, Harvard University's introduction to the intellectual enterprises of computer science and the art of programming for majors and non-majors alike, with or without prior programming experience. An entry-level course taught by David J. Malan, CS50 teaches students how to think algorithmically and solve problems efficiently. Topics include abstraction, algorithms, data structures, encapsulation, resource management, security, software engineering, and web development. Languages include C, PHP, and JavaScript plus SQL, CSS, and HTML. Problem sets inspired by real-world domains of biology, cryptography, finance, forensics, and gaming. As of Fall 2014, the on-campus version of CS50 was Harvard's largest course.

Students who earn a satisfactory score on 9 problem sets (i.e., programming assignments) and a final project will receive a certificate from HarvardX. This is a self-paced course–you may take CS50 on your own schedule.

HarvardX pursues the science of learning. By registering as an online learner in an HX course, you will also participate in research about learning. Read our research statement to learn more.

Students who earn a satisfactory score on 9 problem sets (i.e., programming assignments) and a final project will receive a certificate from HarvardX. This is a self-paced course–you may take CS50 on your own schedule.

HarvardX pursues the science of learning. By registering as an online learner in an HX course, you will also participate in research about learning. Read our research statement to learn more.

What you'll learn

• A broad and robust understanding of computer science and programming
• How to think algorithmically and solve programming problems efficiently
• Concepts like abstraction, algorithms, data structures, encapsulation, resource management, security, software engineering, and web development
• Familiarity in a number of languages, including C, PHP, and JavaScript plus SQL, CSS, and HTML
• How to engage with a vibrant community of like-minded learners from all levels of experience
• How to develop and present a final programming project to your peers

Pursue a Verified Certificate to highlight the knowledge and skills you gain ($90) View a PDF of a sample edX certificate.

Official and Verified
Receive a credential signed by the instructor, with the institution logo to verify your achievement and increase your job prospects.

Easily Shareable
Add the certificate to your CV, resume or post it directly on LinkedIn.

Proven Motivator
Get the credential as an incentive for your successful course completion.

Ways to Earn Harvard Credit

Optionally, you can enroll in the traditional, semester-long course at Harvard Extension School. Courses are offered in fall or spring semesters, or both. You have the option to enroll for undergraduate or graduate credit and will receive grades on a Harvard transcript. Learn more about the course on the Harvard Extension School website.