At the request of Grammar and Linguistics, a pronoun turns out to be a word that fulfills the same grammatical functions as a noun, although the main difference with respect to this is that the pronoun lacks its own lexical content and its referent will be determined by its antecedent. The referent of these words or pronouns is not fixed but variable, that is, it will be determined in relation to others that have already been mentioned. They are commonly referred to people or things that really exist extralinguistically; them They work a lot; Juana doesn't feel as strong as she thought.
All the existing languages in this world have pronouns, while the pronouns of the Spanish language are classified as follows: demonstrative pronouns (with which people, animals or things are indicated or shown: i want that), indefinite pronouns (They allude in a vague and poorly defined way: Have you seen any of your friends?), personal pronouns (directly refers to things, animals and people: I snack), possessive pronouns (gives an account of a possession or belonging: that's mine) and relative pronouns (refers to an animal, person or thing that had already been mentioned).
On the other hand, we can find the classification according to the accent, calling tonics if worn or unstressed if not.
Obviously, personal pronouns indicate person, case, gender and number, while possessives indicate everything mentioned except the case and the rest of those listed above, only gender and number.
Regarding number, most languages distinguish plural and singular forms in the case of personal pronouns, however, there may be some cases in which the pronouns turn out to be invariant in terms of number.
