The primary use of a code repository in software development is to store, manage, and track changes to source code. Code repositories enable developers to collaborate efficiently by providing version control, allowing them to work on the same codebase without conflict. This facilitates the integration of contributions, ensuring a structured development process. Tools within repositories can also automate testing and deployment tasks, enhancing productivity and minimizing errors in the software development lifecycle. Ultimately, repositories serve as the backbone for organized coding practices.