Cognitivism is a learning theory that focuses on internal mental processes like memory, problem-solving, and thinking. It views learning as the process of storing and organizing information in the brain. Key contributors to cognitive theory include Paivio, who proposed dual coding theory of verbal and visual information, Gagne, who developed cognitive learning hierarchies, and Gardner, who proposed multiple intelligences. The theory emphasizes conceptual understanding over rote memorization and has implications for instructional design and technology integration in the classroom.