Special types of files are programs and folders . Programs are instructions that computers can carry out. See Using Electronic Files for basic information on how to work with files. While the computer is on, the OS is always running. We will focus on elements common to all GUIs.
Applications are programs that allow the user to actually accomplish work on the computer.
They instruct the computer to do specific tasks with a certain end in mind. Examples of common types of applications include word processing, spreadsheets, databases, communication programs, and games. Popular applications often have different versions for different operating systems. Some basic applications are included with Windows or the Mac OS or bundled with new computers, but you will probably want to purchase additional programs. Applications are started or launched in a variety of ways, depending on the operating system.