A common feature on smart TVs is the process of upscaling, in which source material of a lesser quality is improved to better match the capabilities of the higher-quality screen. It typically happens when you have a 4K TV, and you're watching older titles that were shot in FHD resolution. The TV can improve the look of what you're watching; it can't transform it into 4K resolution since it wasn't natively shot in that, but with software processes, the TV can make the video look much better.
Source : https://www.pocket-lint.com/downscaling-tv-explained/
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