Jinn are beings that were created by Allah with free will, and live in a world parallel to our own. In the Quran, God says:
“Indeed We created man from dried clay of black smooth mud. And We created the Jinn before that from the smokeless flame of fire” (Quran 15:26-27)
This verse allows us to understand that Jinn were created before mankind, and from smokeless fire, ensuing they are physically invisible to mankind, and this is one of the major reasons why some people deny their existence, as they do not believe in what they cannot see. Their nature is generally fiery due to them being created from fire.
Like humans, Jinn were created to worship God and follow Islam as it states in the Quran:
“I did not create the Jinn and mankind except to worship Me.” (Quran 51:56)
Jinn live the same as mankind. They can be Muslims or non-Muslims, however, a majority of them are non-Muslims due to their fiery nature. The non-Muslim Jinn are part of the army of the Shaitaan, and are also called devils. Like humans, they can become Muslims.
Jinn are also similar to us in other ways. They eat, drink, marry, have children and families, and die, however, their life span far increases our own. Jinn too will also be questioned with humans by Allah on the Day of Judgment and will either enter Heaven or Hell.