GeeksforGeeks covers data structures, algorithms, programming languages, Databases, operating systems, and computer science theory. Its articles are written for students preparing for interviews and exams, with explanations followed by code examples. The site also hosts practice problems, company-specific interview questions, and course materials.

The quality is uneven because many articles are contributed by community members, but the breadth is enormous. For students in India and elsewhere preparing for technical interviews, it is one of the most commonly used resources. Developers also use it as a quick refresher on topics they have not touched in a while. It is a reference site rather than a structured course.