Interactionist theory views social processes as emerging from human interaction. It focuses on how people act and influence each other in face-to-face encounters and ongoing social interactions. Two key founders were George Herbert Mead and Charles Horton Cooley, who examined how individuals relate to society through interaction. Interaction can involve symbolic mental processes (symbolic interactionism) or happen without thinking (non-symbolic interactionism). A core idea is that people understand objects and themselves based on how others respond during social interactions.