1. Let’s start at the beginning: What is 4K?
In short, it’s a video quality upgrade from the current standard, high definition (HD), that, when viewed on a sufficiently large display, is a dramatic improvement. In the next few years, 4K will begin replacing HD as the standard format for home TV and movie viewing. YouTube turned on 4K capability way back in 2010 and relatively cheap 4K filmmaking cameras like the RED have been used by major moviemakers since at least 2008. The term Ultra High Definition (UHD) is sometimes used interchangeably with 4K. Technically, UHD is a broad term that encompasses video resolutions higher than 1080 HD, so to clear up confusion, what we’re talking about will be called 4K.
The term 4K refers to the roughly 4,000 pixels packed into the display. This chart gives you an idea of exactly how much better this format is compared to 1080 HD.