<u>Their</u> crowd spends a lot of time at the swimming pool.
This is an example of possessive pronoun.
Pronouns are the words used in place of noun or noun phrases. Examples include he, she, it, they. They can refer to noun/s that has/have been named previously or in other cases, can be used to refer to nouns that do not need specific mention.
Different classifications of pronouns are relative, reflexive, possessive, demonstrative, interrogative, personal, indefinite, subject, object, reciprocal and intensive.
Possessive pronouns are words that replace the noun and noun phrases to show the expression of possession.
For example. I have lost my water bottle. Can you pass me yours.
Learn more about possessive pronouns here
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