Docker Slim is a tool designed to optimize Docker images by significantly reducing their size and enhancing security without requiring manual intervention. Originally developed during a Docker Global Hack Day in 2015, it utilizes both static and dynamic analysis to streamline Dockerfiles and images, making them up to thirty times smaller. The tool offers various commands such as lint, xray, and profile, each providing detailed insights into the structure and contents of Docker images, helping developers understand and optimize their use. Docker Slim also automatically generates security profiles, such as AppArmor and Seccomp, to enhance the security of containerized applications. Additionally, Earthly is mentioned as a complementary tool that can further streamline CI builds, presenting a comprehensive approach to improving development workflows in environments utilizing Docker.