This makes the icon twice as crisp in any angles or curves, or allows for twice as much detail in the photo. For example, an icon or image might be 64 virtual pixels tall, but on a HiDPI display, it’s drawn with 128 physical pixels.
In short, HiDPI refers to pixel doubling: drawing an image with twice as many physical pixels in each dimension than requested in virtual pixels.
There's a great series of articles explaining the difference between high resolution and HiDPI. With 4K monitors becoming more prominent in the marketplace, it's crucial to define the difference between a high resolution display and a true HiDPI display.
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