The document discusses the behaviorist theory of language acquisition. It explains that according to behaviorism, children learn language through imitation, reinforcement, and practice. When children imitate sounds and words they hear, they are praised or given affection as positive reinforcement, which conditions them to repeat those sounds and words. However, the behaviorist theory has been criticized for not accounting for factors like learning abstract words or novel language not modeled by caregivers. The document also outlines four main stages of language acquisition according to behaviorism: the babbling stage, one-word stage, two-word stage, and telegraphic stage.