Generally, apps describe a wide range of programs (instructions) used by computers and digital devices alike. Of course, many different types of apps are available to perform various tasks. Obviously, your operating system plays a significant role in deciding what you can run on your device. Also, the version of your system can depict which apps are available to you. Doing a little research on your computer and its OS will help you when comes time to add new apps. For example, Anti-Malware software that runs on Windows 1o, may not be compatible with another version of Windows. Knowing your system can go along way to help you pick your new application.