Deserts are places on Earth where there is very little rainfall.
Deserts cover about 15% to 20% of the earth.
Deserts are usually very hot during the day, but at night the temperatures can get very low.
Only certain plants such as cacti are able to grow in deserts.
Many animals that live in deserts stay awake at night and sleep throughout the day in holes they burrow in the sand.
The Sahara desert is the biggest desert in the world.