Retina display is a marketing term used by Apple to indicate a screen density of around 300ppi. At that size, pixels are so small they tend to disappear, making text look sharper and graphics crisp and clean. The first Retina display device was the iPhone 4, which had a 960x640 screen at 3.5-inches, making it 326ppi. The iPod touch followed shortly thereafter. The next was the iPad 3, which had a 2048x1536 screen at 9.7-inches, making it 264ppi. (Because larger screens are generally held further away, a lower density was passable). The Mac went Retina with the 2012 MacBook Pro, and the iPad mini with the Retina iPad mini in 2013.
iMacs, Thunderbolt Displays, and MacBook Airs remain on the Retina want list.
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Rene Ritchie is one of the most respected Apple analysts in the business, reaching a combined audience of over 40 million readers a month. His YouTube channel, Vector, has over 90 thousand subscribers and 14 million views and his podcasts, including Debug, have been downloaded over 20 million times. He also regularly co-hosts MacBreak Weekly for the TWiT network and co-hosted CES Live! and Talk Mobile. Based in Montreal, Rene is a former director of product marketing, web developer, and graphic designer. He's authored several books and appeared on numerous television and radio segments to discuss Apple and the technology industry. When not working, he likes to cook, grapple, and spend time with his friends and family.