Addiction is a complex condition characterized by compulsive and repetitive engagement in a behavior or substance despite negative consequences. For example, a person who is addicted to alcohol may continue to drink heavily even though their drinking has caused problems with their job, relationships, and health. They may feel a strong urge to drink, even when they know it is harmful to them. Over time, addiction can lead to physical dependence, withdrawal symptoms, and a diminished ability to control the behavior or substance use. It can have a profound impact on a person's life, as well as the lives of those around them.