The common term for a region with little rainfall is a desert. Deserts are characterized by their arid conditions, receiving less than 10 inches (250 mm) of precipitation annually. These regions are often known for their extreme temperatures, which can fluctuate significantly between day and night. Deserts can be hot, like the Sahara, or cold, like Antarctica, showcasing the diversity in their environments. Despite their harsh conditions, deserts are home to unique ecosystems and specially adapted plants and animals. Organisms such as cacti and camels have developed remarkable adaptations that enable them to survive in such challenging climates.