Wolfgang Kohler's insight learning theory, developed from his studies on chimpanzees, emphasizes that insight learning is a cognitive process where solutions are realized suddenly, rather than through trial and error. Kohler's experiments with a chimpanzee named Sultan demonstrated four stages of insight learning: leveraging past experiences, intelligence, initial trial and error, and the ability to generalize solutions to similar problems. The theory highlights the importance of internal visualization in problem-solving and suggests that factors like experience and intelligence influence insight.