4K refers to a resolution of 3,840 x 2,160 pixels, a total of about 8.3 million pixels. A Native, or True, 4K projector will deliver all 8.3 million pixels and each pixel is individually addressable on the screen.

A 4K UHD projector will provide a 4K image at a lower price by using pixel shifting technology. The projector rapidly shifts each pixel on the screen providing a faux 4K resolution. These projectors often provide excellent image at a fraction of the price of a Native 4K projector. 

Want to see the difference with your own eyes? Book a projector shootout and see which projector you prefer.