According to theory, every individual learns many things through observation and imitation of other people

The answer is Social Learning Theory. It is an extension of behaviorism that emphasizes that people learn from one another, through observation, imitation, and modeling. The theory has frequently been called a bridge between behaviorist and cognitive learning theories because it encompasses attention, memory, and motivation. This also stresses that other people have over a person's behavior. Even without particular reinforcement, every individual learns many things through observation and imitation of other people.