A DSA (Data Structures and Algorithms) repository on GitHub is a collection of code implementations and resources related to various data structures and algorithms. It typically includes solutions to common problems, implementations of algorithms, and explanations of concepts to help programmers enhance their understanding and problem-solving skills in the field of data structures and algorithms. The repository may contain code in popular programming languages such as C++, Java, Python, etc., organized in a structured manner for easy access and reference. It serves as a valuable resource for students, software engineers, and anyone interested in improving their DSA knowledge and coding abilities.