An addiction is a habit that negatively impacts a person's quality of life across a number of important areas, including their desires, priorities, behaviors, and ability to work and maintain good relationships. A person with an addiction feels a strong desire to continue their behavior despite these negative consequences.
A person can be addicted to a substance, such as drugs or alcohol. This is called substance use disorder. Other behavior patterns, or habits, not related to substance use can have the same negative and addictive qualities as a substance use disorder. Examples include gambling, video games, pornography, and technology.