If you’re in the market for a new TV, you’re probably thinking about getting a 4K or Ultra HD model. Is there a difference, and what exactly should you be looking for when you buy? Here’s what you need to know before diving in. What Do the “Ultra HD” and “4K” Labels Mean? Let’s start by defining “HD.” High Definition Television (HDTV) is the standard that’s been in use for over a decade, and you’ll find it difficult to buy a TV that isn’t at least “HD Ready,” which means capable of displaying at a resolution of 1280×720 (720p). Most modern TVs are at least “Full HD,” which means capable of displaying at a resolution of 1920×1080 (1080p). The “p” stands for “progressive,” meaning that the entire image is drawn each frame.