Phobias are a type of anxiety disorder defined as a persistent fear of an object or situation which the sufferer commits to great lengths in avoiding, is typically disproportional to the actual danger posed, and is often recognized as irrational. In the event the subject of the phobia cannot be avoided entirely, the sufferer will endure the situation or object with marked distress and significant interference in social or occupational activities. There are generalized phobias such as social phobia and agoraphobia, and specific phobias such as as the fear of cats, spiders, water, heights and snakes.