"CD" stands for Compact Disc in the context of software distribution, which refers to a physical medium that was historically used for storing and distributing software applications, games, and media. In modern contexts, "CD" can also refer to a Continuous Delivery pipeline in software development, where software updates are automatically prepared for release. This concept emphasizes the importance of automating the software release process, ensuring that code changes are swiftly and reliably delivered to production environments with minimal manual intervention.