Social Learning Theory proposes that behaviours are learned through the observation of others, leading us to imitate these actions. Observational learning is particularly influential if said behaviour is rewarded.
A classic example of Social Learning Theory is shown in Bandura's Bobo Doll study, whereby children watched a video of an adult model acting aggressive towards a bobo doll, then placed in a room with a replica of the doll. Most of the children imitated the actions of the adult by kicking the doll, shouting at it, and hitting it.