What is “jinn” ?

What does "jinn" mean? Are they good or bad? Are they also tested like human beings?

The word Jinn means “hidden, covered being, unseen thing”. It is the name given to the spiritual beings which can turn into various types and styles that are created from fire.
Although the characteristics of the Jinns are not known completely, in our resources it is pointed that they are created from pure, smokeless, blister fire. Allah’s Apostle (Pbuh) in one of his Hadith says: “Angels were created from light; Jinn were created from smokeless fire.” (Muslim)
Jinns are also being tested in this world like human beings. They will also give an account of what they have done, and they will be rewarded with heaven or punished in hell.
Jinns are capable of penetrating the human mind, brain and system of thinking directly. They can take the control of these areas. (as it is in the fear, worry, dreaming, shudder).
Some of the scholars summarize these beings which cannot be seen by humans as the following and made the subject much clear by separating these spiritual beings in three parts; they say:
“Those good ones which are always under the command of Allah giving good inspiration to the humans as spiritual beings are called the Angels.
Those misleading people by canalizing them doing evils are Devils.
Those spiritual beings having both the evil ones and the good ones are called the

Jinns

."