What's the big deal about a Retina Display?

[M A V I C]

Retina displays are higher res than most print materials. It's a huge deal, though I can't seem to find a way to explain it that wouldn't potentially violate a NDA...

guitarist wrote:
Yes, and to clarify (and with respect to the name, Retina Display) the resolution is so fine that the pixels can't be seen by the human eye. You'd literally need a loop, or a magnifying glass, to detect pixels. That's the breakthrough that Apple is promoting.

I can see the pixels just fine. Of course, I can see 1200dpi stochastic dots without a loop too.