HD (High Definition) Definition - Tech Terms
https://techterms.com/definition/hd
HD describes any video with a resolution greater than standard definition (SD) video. While "high-definition" has a broad scope, it can also refer to a specific HD resolution, such as 1920x1080 pixels. Before HDTV was introduced in the late 1990s, the most common video resolutions were 640x480 (NTSC) and 720x576 (PAL and SECAM). The NTSC (National Television Standards …
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