Mini DisplayPort

Mini DisplayPort is a smaller version of the DisplayPort connection interface specified by the Video Electronics Standards Association (VESA). Despite its small size, Mini DisplayPort has a full 20 pins and can support up to a 30-inch display with a 2560 by 1600 screen resolution.

History
Mini DisplayPort was released by Apple in October 2008. Apple uses the port in the MacBook family and its desktop line. The connector can be used by Apple and third party displays. Adapters can allow it to support older video connectors.

Mini DisplayPort was superseded by the Thunderbolt port, which uses the same connector type.