To watch or read the news is an effort in trying to see what this world is coming to. The Bible is full of the reality of Demons, Devils and Darkness.
We see the effect of Demons and Devils every day and no longer wonder why this world has been thrown into darkness.
The Word, "Demon", has a number of meanings, all related to the idea of a spirit that inhabited a place, or that accompanied a person.

In Hebrew demons were workers of harm. To them were ascribed the various diseases, particularly such as affect the brain and the inner parts. For by controlling the brain and thoughts, Demons and Devils can control the physical body.

The Word,