What is a conjunction?

A conjunction is a word that serves the specific function of joining two phrases, clauses, or sentences together, facilitating smoother and more coherent communication. This connection can help clarify the relationship between ideas or actions in writing or speech. Common examples of conjunctions include "and," "but," "or," and "because," which link both similar and contrasting ideas.

The other options pertain to different parts of speech that serve unique purposes: a word that shows a relationship of time is typically an adverb or a preposition, a word that describes a noun refers to an adjective, and a word that expresses strong emotion would be an interjection. Each of these plays a distinct role in sentence structure and meaning, but they do not fulfill the connecting function that defines conjunctions.