In Windows: Maximizing Windows
The Windows maximize button (see Figure 24-1) is similar, but not identical, to the Macintosh zoom button. When you click the Windows maximize button, the window expands to fill the entire screen (instead of growing only as large as necessary to show the entire contents, as on the Macintosh). If you maximize a Web browser or word processor window on a large screen, therefore, you may end up with long and hard-to-read lines of text.
Because Windows is window-centric, rather than application-centric, like the Macintosh, many Windows users work with all applications maximized at all times. As a result, they see only one window at a time, and use the Taskbar or Alt-Tab to switch between applications.
When you click the maximize button, its icon changes to what’s called a restore button. Click it to restore the window to its original size.