Answer: Codependency is the excessive manifestation of concern towards other people's problems.
Explanation: When we talk about codependency we are talking about a person who clings in an unhealthy way towards another person. You feel that that person is everything in your life and you don't have time to think about anything else but that person. A codependent person cares more for the other than for himself.
Some of the effects of codependency are low self-esteem, anxiety, and depression. The person remains sad if sees that it cannot be with the person it loves, the person can reach the edge of despair and do whatever it takes to make the other person feel good, without knowing that its behavior is toxic.