BuildKit is a modern build subsystem designed to enhance the security and efficiency of Docker image building by managing secrets securely. It improves upon the legacy Docker builder with advanced features like parallelization, caching, and a fully concurrent build graph solver, leading to faster and more precise builds. One of the key advantages of BuildKit is its ability to handle sensitive information such as API keys and database credentials securely during the build process, without exposing them in the Dockerfile or final image. This is particularly relevant for companies like XYZ Corporation, which face security risks by embedding credentials directly into Dockerfiles. By using BuildKit's secrets handling feature, developers can ensure that critical secrets remain protected and do not end up in the final Docker image, aligning with best practices for modern software development. The tutorial demonstrates how to set up a secure build process using Docker BuildKit, emphasizing the importance of safeguarding sensitive data while maintaining efficient containerization workflows.