Abnormality refers to behaviors, thoughts, or emotions that deviate significantly from societal norms or expectations, often leading to distress or impairment in functioning. This concept is crucial for understanding mental disorders, as it helps distinguish between what is considered normal and what is categorized as abnormal in various cultural contexts. Abnormality is multifaceted, encompassing statistical rarity, social deviance, and personal distress, which are all important for diagnosing and treating mental health issues.