Like, prepositions, pronouns and determiners, conjunctions are a small and stable class of terms. There about 30 words used as conjunctions in English.

Conjunctions have the function of stringing together two or more grammatical elements together. Conjunctions are used to join multiple clauses into a single sentence and a string of adverbials in a single statement. They are also used in noun-terms, adjective-terms and adverb-terms to build a list of ideas.