Which of the following best describes a conjunction?

The best description of a conjunction is that it is a word used to join words or groups of words. Conjunctions play a crucial role in sentence structure, as they connect phrases, clauses, and individual words, allowing for more complex and nuanced expressions in language. Common examples include "and," "but," "or," "so," and "because," each serving to link ideas logically.

Understanding how conjunctions function helps clarify relationships between different parts of sentences, aiding both in comprehension and construction of more sophisticated statements. The other options describe different types of words: a pronoun replaces nouns, an interrogative word indicates a question, and a verb denotes an action or state, none of which properly characterize the function of conjunctions.