With HD TVs and computer monitors both approaching somewhat normal levels in pricing, nowadays 4K is becoming a bit more mainstream. UHD is an "umbrella term" that encompasses higher resolutions (more pixels) than HDTV, as well as more realistic color and higher frame rates. Today and this year, pretty much the only one of those improvements available in new TVs and content is 4K resolution, so that's what we'll talk about here. Judging from the new TVs shown at CES 2014, manufacturers are tripping over themselves to bring you a new array of 4K compatible products. When used in a home context, 4K/UHD means the TV's screen has a minimum resolution of 3,840 pixels wide and 2,160 pixels high, making it the equivalent to two 1080p screens in height and two in length. This resolution was originally known as "Quad HD", and it's used by basically every 4K TV.
Put it into a nutshell, 4K UHD has gradually changed people's life no matter you are watching TV or using a camera, this high technology has developed maturely and been applied in all walks of life nowadays. The screen acts as a window to the future, and the resolution decides how far and how clear we human could see and predict.