What hypothesis is Krashen known for regarding language acquisition?

The Acquisition Learning Hypothesis is a cornerstone of Stephen Krashen's theories on second language acquisition. In this hypothesis, Krashen distinguishes between two different ways of learning a language: 'acquisition' and 'learning.' Acquisition refers to the subconscious process of absorbing a language naturally, similar to how children learn their first language, while learning involves a conscious understanding of grammatical rules and vocabulary.

Krashen argues that language acquisition is more effective than language learning for developing fluency in a second language, as the former allows learners to internalize language structures in a meaningful context. This emphasis on natural interaction and the importance of a low-anxiety environment for acquisition aligns with Krashen's overall philosophy that language learning should focus on communication rather than rote memorization of rules.

The other hypotheses mentioned contribute to the broader framework of second language acquisition theories but focus on different aspects. For instance, the Interaction Hypothesis emphasizes the role of social interaction in language learning, the Monitor Hypothesis discusses the use of learned knowledge to edit speech, and the Comprehensible Input Hypothesis conveys that learners progress in their language ability when they are exposed to language that is slightly above their current proficiency level. While all play a role in understanding how languages are acquired, the Acquisition Learning Hypothesis specifically