Ingratiation is an impression management strategy based upon using flattery,supporting the opinions of the other person,doing favors,smiling excessively in support of the person,and so on.

Ingratiation

A psychological technique where an individual attempts to become more likable to their target, often through flattery or other forms of manipulation.

Impression Management

The conscious or unconscious attempt by individuals to influence how others perceive them.

Flattery

The act of giving excessive praise or compliments, often to gain favor or advantage.