What is fear definition?

Fear is a natural, instinctive emotion triggered by perceived danger, harm, or threat. It is an adaptive response that alerts humans and animals to potential danger and helps them respond to it appropriately. Fear can be a mild feeling of unease or can be a strong, overwhelming emotion that can cause physical and psychological symptoms, including increased heart rate, sweating, trembling, and panic attacks. While the emotion can be helpful in certain situations, excessive fear can be debilitating and interfere with daily activities and quality of life. Fear is often associated with anxiety disorders, phobias, and posttraumatic stress disorder (PTSD).