The term "plural" refers to the grammatical form used to indicate that there is more than one of something. In English, nouns typically form their plural by adding an "s" or "es" at the end. For example, the plural of cat is cats, and the plural of box is boxes. In addition to nouns, plural forms can also apply to pronouns, such as changing I to we or he/she to they. Understanding plural forms is essential for proper communication, as it helps convey the correct quantity of people, objects, or ideas in a sentence.