Answer:
Although there are psycholinguistic characteristics that all humans share, language learning and teaching is always embedded in cultural and social structures. Languages die out, their uses in a speech community shift over time, and new languages emerge. An individual may lose or gain fluency in a language, or several languages, over their lifetime.
These events are rarely because of conscious individual choice. Implicit or explicit language policies shape individual language use. The prestige or stigma attached to a particular language in a society will usually reflect power hierarchies in that society. Globalization creates demand for fluency in some of the dominant world languages, while at the same time it opens up opportunities for speakers of small languages to communicate easily over distances and use technologies to maintain or revitalize their languages
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