They standards are more alike than different, but one is common to TVs and the other is typically found only on PCs.
The HDMI audio/video interface standard is everywhere: TVs, set-top boxes, media streamers, Blu-ray players, A/V receivers, gaming consoles, camcorders, digital cameras, and even a few smartphones. You’ll also find an HDMI output port in most consumer desktop and laptop computers, as well as an input port on many all-in-one PCs, to enable a gaming console or a set-top box may use its internal display.
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https://www.pcworld.com/article/2030669/hdmi-vs-displayport-which-display-interface-reigns-supreme.html
