4K resolution, often referred to as Ultra High Definition (UHD), refers to a display resolution with approximately 4,000 pixels horizontally. Specifically, the most common 4K resolution for televisions and monitors is 3840 x 2160 pixels, which is four times the resolution of Full HD (1920 x 1080). This higher pixel count results in sharper, more detailed images and a more immersive viewing experience.
This video explains the difference between 4K and 1080p resolutions, including the impact of pixel density and viewing distance:

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Jeff Rauseo
YouTube · 8 Jun 2024
Key aspects of 4K resolution:
Pixel Count:
4K displays have a resolution of 3840 x 2160, totaling approximately 8.3 million pixels.
Ultra High Definition (UHD):
4K is often used interchangeably with UHD, though UHD technically includes other resolutions like 7680 x 4320.
Enhanced Detail:
The increased pixel density in 4K displays allows for more detail and sharper images compared to lower resolutions like 1080p.
Improved Viewing Experience:
4K provides a more immersive experience, especially on larger screens, as individual pixels are less noticeable.
Applications:
4K resolution is widely used in televisions, monitors, digital cinema, and other applications where high image quality is desired.
Types of 4K:
4K UHD (3840 x 2160): The dominant standard for televisions and consumer displays.
DCI 4K (4096 x 2160): Used in digital cinema and has a slightly wider aspect ratio.
4K vs. Other Resolutions:
4K vs. 1080p:
4K offers four times the pixel count of Full HD (1080p), leading to significantly sharper and more detailed images.
4K vs. 2K:
2K (also known as 1440p) has a resolution of 2560 x 1440, which is less than half the pixel count of 4K.
This video compares 4K and 2K images, including upscaling to the same resolution and highlights the differences in image quality and