Systemic functional linguistics (SFL) is a theory of language that views grammar as a network of systems for making meaning, with a focus on the functions of language in social contexts. SFL analyzes language across four strata - discourse, semantics, lexicogrammar, and phonology/graphology - and accounts for language structure, word choice, and the influences of social factors like context, culture, and communicative purpose. SFL places language use and meaning-making as central rather than viewing language through a strictly structural lens.