It is a digital display interface developed by the Video Electronics Standards Association (VESA).
A Mini DisplayPort display or a display connecting with a Mini DisplayPort to VGA, DVI, or HDMI adapter will work just like it was connecting to a Mini DisplayPort connector when plugging in directly to the Thunderbolt connector on your Apple computer. When connecting a Mini DisplayPort display or a display using a Mini DisplayPort adapter to a Thunderbolt peripheral (except as described in question 24), make sure the display is connected at the end of the Thunderbolt chain. You can use only one Mini DisplayPort device in The downside of DisplayPort at the moment is that it doesn't support ethernet data, and the standard doesn't have an audio return channel. However, it is capable of multiple video outputs which means more than one display. See also: How to connect two displays to a laptop with one DisplayPort connector. Meanwhile, HDMI version 1.4 is the most common at the moment. This supports the same 4K resolution as DisplayPort 1.2, but at just 30 Hz (or 4096 x 2160 at 24 Hz). HDMI 2.0 is new on the scene in a few devices such as this Sony TV.  For example, DVI and HDMI are generally convertible using a simple adapter. Some DisplayPort connections will also work with DVI and HDMI with an adapter, but not all. Native resolution. All modern televisions will convert the incoming signal to whatever their native resolution is. For most TVs, this is 1,920x1,080 pixels. But if you want to connect a computer to your TV (or you've got a new computer monitor), the options tend to be HDMI, DisplayPort, DVI, and sometimes old-school VGA. DisplayPort is a digital display interface developed by the Video Electronics Standards Association (VESA). The interface is primarily used to connect a video source to a display device such as a computer monitor, though it can also be used to carry audio, USB, and other forms of data. A notable limitation of dual-mode is that it can only transmit single-link DVI (and HDMI), as the number of pins in the DisplayPort connector is insufficient for dual-link connections. As a result, an active converter is needed for Dual-Link DVI and analog component video such as VGA. DisplayPort is the newest digital video interface connect, designed as a replacement for the DVI standard currently in use on computer hardware. It is similar in specification to the HDMI standard, but unlike HDMI, DisplayPort is being targeted as a computer-interface more than a home-theater-interface. VGA and DisplayPort-Unfortunately VGA supports only analog-based signals, and DisplayPort only digital-based. A conversion from VGA to DisplayPort (or vice versa) will require an electronic convertor, much like today's VGA to DVI-D units. The DisplayPort LVDS signal protocol is not compatible with DVI or HDMI. However, Dual-mode DisplayPorts are designed to transmit a single-link DVI or HDMI 1.2/1.4 TMDS protocol across the interface through the use of an external passive adapter that selects the desired signal and converts it from 3.3 volts to 5 volts. A notable limitation of dual-mode is that it can only transmit single-link DVI (and HDMI), as the number of pins in the DisplayPort connector is insufficient for dual-link connections. As a result, an active converter is needed for Dual-Link DVI and analog component video such as VGA. Geoffrey Morrison/CNET. With televisions, HDMI is the most common connector. But if you want to connect a computer to your TV (or you've got a new computer monitor), the options tend to be HDMI, DisplayPort, DVI, and sometimes old-school VGA. In these situations it will appear as though the Displayport is being converted to DVI, but it's actually the hardware outputting a DVI signal through a Displayport connector. If the hardware in use is not capable of outputting this DVI signal, then a Displayport-to-DVI adaptor will not function properly. VGA and DisplayPort-Unfortunately VGA supports only analog-based signals, and DisplayPort only digital-based. A conversion from VGA to DisplayPort (or vice versa) will require an electronic convertor, much like today's VGA to DVI-D units. With televisions, HDMI is the most common connector. But if you want to connect a computer to your TV (or you've got a new computer monitor), the options tend to be HDMI, DisplayPort, DVI, and sometimes old-school VGA. DisplayPort is a computer connection format. There is only one television with DisplayPort, and don't expect it to see much further adoption on the TV side. It's capable of 3,840x2,160-pixel resolution at 60fps, if you have at least DisplayPort 1.2 and the Multi-Stream Transport feature. Although DisplayPort has much of the same functionality as HDMI, it is a complementary connection used in different scenarios. DisplayPort can emit an HDMI signal through the use of a passive adapter connected to a port that is designed for dual-mode. A notable limitation of dual-mode is that it can only transmit single-link DVI (and HDMI), as the number of pins in the DisplayPort connector is insufficient for dual-link connections. As a result, an active converter is needed for Dual-Link DVI and analog component video such as VGA.
https://support.apple.com/en-us/HT204154 http://www.pcadvisor.co.uk/feature/digital-home/displayport-vs-hdmi-whats-difference-3535257/ http://www.cnet.com/news/hdmi-vs-displayport-vs-dvi-vs-vga-which-connection-to-choose/ https://en.wikipedia.org/wiki/DisplayPort http://www.datapro.net/techinfo/displayport_info.html https://en.wikipedia.org/wiki/DisplayPort http://www.cnet.com/news/hdmi-vs-displayport-vs-dvi-vs-vga-which-connection-to-choose/ http://www.datapro.net/techinfo/displayport_info.html http://www.cnet.com/au/news/hdmi-vs-displayport-vs-dvi-vs-vga-which-connection-to-choose/ https://en.wikipedia.org/wiki/DisplayPort
what is a displayport connection