How many types can deserts be classified in?

There are five types of deserts classified in the world today. Some are subtropical, coastal, rain shadow, interior, and polar. These places are so varied as to their location on the various continents that it defies logic. You would normally expect deserts to be nearest to the equator, but that is not the case.

As there are five types of deserts in this world, only about 20% of these deserts are covered in sand. Cold deserts are often covered in ice or snow, and these are surely different from those hot deserts. But according to definition, deserts are places with the lowest precipitation. Now, the largest hot desert on Earth is the Sahara desert.