A window is an area on the screen that displays information for a specific program. This often includes the user interface GUI as well as the program content. Windows are used by most applications as well as the operating system itself. A typical window includes a title bar along the top that describes the contents of the window, followed by a toolbar that contains user interface buttons. Most of the window's remaining area is used to display the content.
Most windows can be opened, closed, resized, minimized, and moved around the screen. The close, minimize, and zoom buttons are located on the title bar (on the right side on Windows and the left side on Macs). Minimizing a window will close the contents of the window, but store a reference to it in the Taskbar (Windows) or the Dock (Mac). Closing a window will make it disappear completely (so you may be asked to save your changes first). To move a window, click on the title bar and drag the window where you want it. To resize a window, either click the Zoom button in the title bar or click the lower right-hand corner and expand or contract the window to the size you want.