What is Fear?

What is fear? Why are thing creepy?

We know fear as an instinctive reaction to danger. But what about when we get afraid of something that is not entirely dangerous? The likes of ghosts, clowns, or some thing that we do not understand makes us uneasy. 

Fear has been characterized into three kinds: Gross-outs, horror, and terror. Fear has been described to be “being creeped out is an adaptive human response to the ambiguity of threats. And that between the safeness and danger, there lies a valley of ambiguity. Which produces fear.