A 4K monitor is a display device that offers a resolution of 3840 x 2160 pixels, which is four times the resolution of a standard 1080p monitor. This higher pixel count results in sharper images and more detailed visuals, making it ideal for activities like gaming, video editing, and watching movies. These monitors are increasingly popular among professionals and enthusiasts alike due to their ability to display vibrant colors and fine details. Many 4K monitors also support features like HDR (High Dynamic Range) for improved contrast and brightness, enhancing the overall viewing experience.