The mini-DisplayPort was introduced in October 2008 and is the current Apple standard for laptop computers. This connector 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 released since October 2008.
With the correct adapter, mini-DisplayPort computers can drive DVI, VGA, or HDMI displays.
There are so many suppliers and online shop provides gadget to convert.
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Mini Display to HDMI Cable, Mini Display to DVI Cable, Mini Display to VGA Cable
