A phobia is an intense, persistent, and irrational fear of a specific object, situation, or activity that is typically out of proportion to the actual danger posed. People with phobias often go to great lengths to avoid the source of their fear, and when they are confronted with it, they may experience overwhelming anxiety or panic. Phobias are classified as a type of anxiety disorder and can significantly impact daily functioning and quality of life. They can develop from traumatic experiences, learned behaviors, or even without any clear cause.