A systems program can refer to any software application that works directly with the computer's operating system to manage its resources and enable users to interact with the machine. Some common synonyms for systems programs include system software, operating system software, utility software, and system tools. These types of programs are designed to perform specific functions such as optimizing performance, managing files and storage, providing security features, and enabling communication between the computer and other devices. Some of the most well-known examples of systems programs include Microsoft Windows, macOS, UNIX/Linux, antivirus software, and disk defragmentation utilities. Without these essential programs, users would not be able to effectively utilize their computers.