In psychology, codependency is a theory that attempts to explain imbalanced relationships where one person enables another person's self-destructive behavior, such as addiction, poor mental health, immaturity, irresponsibility, or under-achievement.
Definitions of codependency vary, but typically include high self-sacrifice, a focus on others' needs, suppression of one's own emotions, and attempts to control or fix other people's problems.
People who self-identify as codependent are more likely to have low self-esteem, but it is unclear whether this is a cause or an effect of characteristics associated with codependency.