The word ‘their’ is a possessive pronoun. It is used to indicate ownership or possession by multiple people. For instance, in the sentence ‘Their car is parked outside,’ ‘their’ shows that the car belongs to a group of people.
Possessive pronouns, including ‘their,’ ‘his,’ ‘hers,’ and ‘its,’ help us understand relationships and ownership in sentences. Unlike adjectives, which can modify nouns directly (like ‘my car’), possessive pronouns stand alone and replace the noun they are modifying.