http://www.fool.com/investing/general/2015/10/24/4k-tv-what-you-need-to-know.aspx
TV technology just keeps marching on. In 2008, only 34% of American households owned a high-definition TV set. Today, even the smallest and cheapest TV available in your local electronics store comes with a modestly high-def 720p screen. And the basic HDTV sets are being squeezed out by an even higher-definition experience. Say hello to the 4K TV, also known as Ultra HD.