Substance use disorder (SUD) is a complex condition characterized by an individual's compulsive use of substances despite harmful consequences to their health, relationships, and daily functioning. It often involves a lack of control over consumption, leading to tolerance and withdrawal symptoms. SUD affects various aspects of an individual's life, including physical health, mental well-being, and social relationships, making it a multifaceted public health issue. Effective treatment typically requires a comprehensive approach, including behavioral therapies, counseling, and, in some cases, medication-assisted treatment, emphasizing the importance of a supportive environment for recovery and long-term management.