This document discusses theories of second language acquisition and learning. It addresses several key topics: 1) There is debate around how language is learned, and many theories exist but none are fully accepted. Factors like personality, age, cognition, motivation, experiences, culture, and instruction all influence acquisition. 2) Learning a second language involves both conscious learning and subconscious acquisition. Very little acquisition occurs without real-world practice and motivation. 3) Theories discussed include Piaget's stages of child development and knowledge acquisition, and Chomsky's theory of universal grammar and the importance of quality language experiences for children's acquisition.