Ultra-high-definition (UHD) refers to a resolution standard for digital television, video, and digital cinema. It typically has a resolution of 3840 x 2160 pixels, which is four times the pixel count of high-definition (HD) at 1920 x 1080 pixels. This increased pixel density allows for sharper images and more detailed visuals, enhancing the viewing experience. UHD is often associated with 4K technology, which is commonly used in modern televisions and streaming services. The higher resolution is particularly beneficial for large screens, as it reduces the visibility of individual pixels, resulting in a more immersive and lifelike picture quality.