The DP interface is “DisplayPort”, and DisplayPort is a display interface published by the Video Electronics Standards Association (VESA). As the successor to DVI, DisplayPort will add support for high-definition audio signal transmission while transmitting video signals, while also supporting 8K resolution.
There are DisplayPort connectors and Mini DisplayPort connector (receptacle and plug) Vistar Electronics manufacturing
Clearly the mini DisplayPort connector uses a physically different connector it shares with Thunderbolt 1 or 2 and has no locking mechanisms like a full size DisplayPort jack and plug offer. Not that every plug actually takes advantage of this. Early versions of Mini DisplayPort (mDP) can display the same maximum resolution as the original size DisplayPort (DP). On the DisplayPort 1.1a version, both can show up to a 2560 x 1600 resolution, and in the 1.2 version, up to a 4096 x 2160 resolution. However, there are no Mini DisplayPort cables that support versions 1.3/1.4/1.4a or 2.0. You’re limited to the amount of bandwidth that the 1.2 version can output with the Mini.
.Why does the DP interface appear? Do you want to add another HDMI if you have it? This involves the word “money”-the DP interface is free to use, unlike HDMI that requires a license fee! It can be noted that PC devices including displays now have DP interfaces, while TVs and other home appliances have only HDMI interfaces.