what comes with a mac desktop display
Choose a screen saver. Your Mac comes with several screen savers that display photos, messages, artwork from your iTunes library or photo library, and more. From the Apple menu, choose System Preferences, then click Desktop & Screen Saver. Click the Screen Saver tab. Screen savers appear on left side of the window, and a preview of the selected screen saver appears on the right. Click a screen saver to select it.