The MacBook, MacBook Pro, and MacBook Air each have a Mini DisplayPort that allows you to connect an external display or projector using an adapter. You can use an external display as your main workspace or to extend your desktop, or you can work in mirrored mode with a projector so you can view what your audience sees.
About:
The Mini DisplayPort is a miniaturized version of the DisplayPort interface. First publicly announced by Apple on October 14, 2008, it is used in revisions of the MacBook, MacBook Air, and MacBook Pro notebooks, iMac, Mac Mini, and Mac Pro desktops and also the 24-inch Apple Cinema Display. Unlike its Mini-DVI and Micro-DVI predecessors, Mini DisplayPort is capable of driving resolutions up to 2560x1600, commonly used with 30-inch displays. With a suitable adapter, On January 13, 2009, VESA announced that Mini DisplayPort would be included in the upcoming DisplayPort 1.2 specification.
