The largest desert in the world is Antarctica, which is classified as a cold desert due to its extremely low temperatures and minimal precipitation. Despite being covered in ice, Antarctica meets the criteria for a desert because it receives very little moisture, averaging about 2 inches of precipitation annually. It spans approximately 14 million square kilometers, making it not only the largest desert but also the fifth-largest continent. This unique ecosystem is home to various species adapted to its harsh conditions, including penguins, seals, and numerous microorganisms that thrive in extreme environments.