What is what does plural mean?

Plural refers to a grammatical form that denotes more than one. In English, plural is usually indicated by adding an "-s" or "-es" to the end of a word (e.g. cats, dogs, books, boxes). However, there are also irregular plural forms (e.g. children, men, mice). Plural is important in communication because it helps to indicate quantity, and it can also affect other parts of speech, such as verb conjugation and pronoun agreement.