A "Build Driver" is a tool or system that automates the process of compiling and assembling software code into executable programs. It helps developers streamline their workflow by managing dependencies, running tests, and packaging applications. This automation reduces the chances of human error and ensures consistency in the build process. Typically, a build driver integrates with version control systems like Git and can be configured to trigger builds automatically when code changes are made. Popular build drivers include Jenkins, Travis CI, and CircleCI, which support continuous integration and delivery practices in software development.