Final answer:
Phobia can be defined as a strong, irrational fear of a specific object or situation. This fear is often out of proportion to any actual danger posed by the object or situation.
Step-by-step explanation:
Phobia can be defined as a strong, irrational fear of a specific object or situation. This fear is often out of proportion to any actual danger posed by the object or situation. For example, someone with arachnophobia, which is a phobia of spiders, may experience intense fear and anxiety even when they encounter a harmless spider.