title: Why do I need @1x, @2x and @3x iOS images?
body: <p>Why do we need these 3 particular image types?</p>
  
  <p>If I have a button on my app with a background image say, 50 pixels x 50 pixels, why do I need 3 versions of this image?  What's stopping me from just making one image that's much higher in res, say, 700x700 so when it shrinks down on any iPhone it won't fall under the max res the device would want?</p>
  
  <p>Only thing I can think of is it just takes up more space, but for simple apps / a simple button it seems like it wouldn't cause any issues.  I've tried it on a few devices and see no difference between them when I simulate it and do this method.  However, as I dive more into apps and stuff I'm sure there is substance behind this technique.</p>