Antarctica is a desert.



Because Antarctica is a "polar" region, there is little precipitation, it has no lakes or rivers and is in fact the driest continent. The interior of Antarctica is considered the world's driest desert because the extreme cold freezes water vapour out of the air.
Annual snowfall on the polar plateau is equivalent to less than 5 cm of rain.
A desert is defined as an area of low and irregular rainfall, no permanent surface water and no substantial vegetation.
Yes, because there is very little rainfall or moisture in the air, because most of the water stays frozen.