In Arabian and Muslim mythology a Jinn is an intelligent Spirit which is ranked lower than am Angel. They are also believed to be able to take on the form of humans and animals and some say they even have the ability to possess human beings.
Often mentioned in the Quran, they are said to have being created from the smokeless scorching fires of hell.
They are said to be physical in nature and that they can physically intereact with the living.
These entities like humans and angels harness the power of free will, so in reality they can be good, evil and benevolent.
In modern day culture the Jinn are often portrayed as Genies, which we all know are beings with magical powers that have the ability to make our wishes come true.