A 4K TV is a television that has a resolution of 3840 x 2160 pixels, which is four times the resolution of standard 1080p HD TVs. This higher pixel count allows for sharper images and more detailed visuals, making it ideal for watching movies, sports, and playing video games. Many 4K TVs also support high dynamic range (HDR), enhancing color and contrast for a more vibrant viewing experience. They often come with smart features, allowing users to stream content from popular services like Netflix and YouTube directly on the TV.