From Wikipedia: Language acquisition is the process by which humans acquire the capacity to perceive, produce and use words to understand and communicate. This capacity involves the picking up of diverse capacities including syntax, phonetics, and an extensive vocabulary. This language might be vocal as with speech or manual as in sign. Language acquisition usually refers to first language acquisition, which studies infants' acquisition of their native language, rather than second language acquisition that deals with acquisition in both children and adults of additional languages. Language learning centres on issues such as child, second, and foreign language acquisition, language education, bilingualism, literacy, language representation in mind and brain, culture, cognition, pragmatics, and intergroup relations.

I totally agree with jura. this kind lady will always give us her professional explanations ^_^ So, firstly, i'd like to show her big thumb up ^_^ OR we can understand the differences in the following way. In short, language acquisition is to native speakers what language learning is to second language learners. Language acquisition means we learn a language by using it daily.say, the acquisition of one's NATIVE language (mother tongue), while language learning follows a systematic way of learning, which usually takes place in school, and it's mainly based on a series of textbooks. and only students from non-english-speaking countries who major in English in university are required to study the language through Language acquisition