The word "his" is a possessive pronoun used to indicate ownership or association with a male individual. It is commonly used in sentences to show that something belongs to or is related to a man or boy. For example, in the sentence "This is his book," the pronoun "his" specifies that the book belongs to a male person. In English grammar, "his" can also function as an adjective when describing nouns. It helps clarify relationships and ownership, making communication clearer. For instance, in the phrase "his car," the word "his" tells us that the car is associated with a specific male individual, distinguishing it from others.