1. Second language acquisition refers to learning additional languages beyond a person's first language. It can occur in both children and adults.
2. There are differences between foreign language learning, which occurs in a community that does not speak the target language, versus second language learning, which takes place in a community where the target language is spoken.
3. Language acquisition occurs subconsciously through exposure and natural environments, resulting in better fluency, while language learning is a more conscious process typically involving formal instruction of rules which results in more knowledge about the language.