This document defines addiction and discusses its various types. Addiction is defined as a psychological and physical inability to stop consuming a substance or engaging in an activity, even when it is causing harm. The most common addictions are to drugs like nicotine, THC, opioids, and cocaine, as well as alcohol, caffeine, gambling, food, technology, sex, and work. Signs of addiction include social and behavioral changes, health issues, and an inability to control substance use or harmful behaviors. Treatment involves medication, psychotherapy, medical services, and support groups. Untreated addiction can lead to long-term physical, psychological, social, and economic consequences.