High-definition video is video of higher resolution and quality than standard-definition. While there is no standardized meaning for high-definition, generally any video image with considerably more than 480 vertical scan lines or 576 vertical lines is considered high-definition.
High-definition video (HDTV Video or HD video) is video of higher resolution and quality than standard-definition.
To watch Netflix in HD, ensure you have an HD plan, then set your video quality setting to Auto or High. Titles will play in HD as long as you have a connection speed of 5.0 megabits per second or faster. Higher quality video uses more bandwidth than lower quality video.