What is slang commonly defined as in the context of language?

Slang is commonly identified as a nonstandard form of a language. This characterization reflects how slang often includes informal language, colloquial expressions, and terms that may not be widely accepted in formal contexts. Slang words and phrases can be specific to particular social groups, regions, or even communities within a language, and they can evolve quickly, often becoming outdated as language trends change.

Nonstandard forms diverge from the established rules of a language and are used primarily in casual conversation rather than formal writing or speech. This usage illustrates how language is dynamic and culturally influenced, further emphasizing the creative and playful aspects of communication. In contrast to the other options, which refer to standard forms, formal dialects, or regional accents, slang is specific in its informality and is not typically recognized in formal academic or professional settings.