A 4K camera captures video and images at a resolution of 3840 x 2160 pixels, which is four times the detail of standard 1080p HD cameras. This higher resolution allows for sharper images and more vibrant colors, making it ideal for professional photography, filmmaking, and streaming. Many 4K cameras come with advanced features such as improved low-light performance, faster autofocus, and higher frame rates. They are popular among content creators, including YouTubers and filmmakers, who seek to produce high-quality visuals for their audiences.