The term has become all too common when buying Apple products, but most of us do not really know what it means.
We have come to believe it means an extremely clear screen, as we expect nothing less from the premium products bestowed upon us by the late Steve Jobs.
Luckily, Apple Technician Nimish Jalal has come to our rescue. The term came into being in late 2011, when Steve Jobs launched the Apple iPhone 4.
What's funny is that this particular phone did not even have a HD screen. Its resolution was a paltry 960 pixels by 640 pixels.
Apple however confirmed that the phone's pixel density (which is the amount of pixels concentrated into a particular point) was a massive 326 ppi (pixels per inch).
Most phones fall between 150 and 250 ppi. Such a high pixel concentration results in a much clearer and sharper image, and more vibrant colors.
There has been debate about the amount of pixel density that the human eye can discern, given that most people use their phones about a foot away from their eyes.
However, Nimish has stated that any screen with a pixel density of above 320 ppi can be referred to as a retina display.
The consensus is that a retina display is therefore any screen which when viewed from a normal distance results in being unable to see individual pixels.
The term is used for phones, tablets, laptops and PC monitors, and as a consumer, when buying a gadget just make sure the pixel density is above 200 ppi, as all screens above this appear equally clear and sharp.