created through mystery, suspense, gore, terror or shock.
in order for a horror film to be seen it must be relevant to the potential viewers. Therefore, horror films capture human fears (global panic, societal fears) such as death or murder.
It could also take on cultural relevance that deals with societal issues. For example, subgroups such as teenagers have many horror films written about them.
Lastly, personal relevance that is either identified with the protagonist or in a way that condemns the antagonists or victims to their ultimate fate.