How to define "lying" in psychology?

Lying is an act of hiding, prevaricating and prevaricating things that people don't want to know in order to avoid the consequences of telling the truth.

For example, a child wants to surf the Internet in an Internet cafe, but he lied to his parents about playing ball with his classmates.

For example, in a unit, A is afraid that B's performance will overshadow itself, so he hides B's performance from his superiors.

For example, if a person works in a foreign country and suffers some grievances, tell his parents that he is doing well in a foreign country and let them not worry. This is a white lie. )