The word ‘my’ is classified as a possessive pronoun. However, it can also be considered a determiner, which is a type of adjective that specifies ownership.
In grammar, pronouns replace nouns or noun phrases, whereas adjectives describe nouns. The word ‘my’ shows possession and is used to indicate that something belongs to the speaker.
For example, in the sentence ‘This is my book,’ ‘my’ indicates that the book belongs to the speaker. Thus, while it functions like an adjective by providing more information about the noun ‘book,’ it primarily serves the role of a possessive pronoun.