The word ‘our’ is a possessive pronoun. It is used to indicate ownership or belonging to a group that includes the speaker. For example, in the sentence ‘Our house is big’, ‘our’ shows that the house belongs to the speaker and others included in the group. Possessive pronouns help us specify to whom something belongs without having to repeat the noun. In this case, ‘our’ replaces the need to say ‘the house of us’ or ‘the house that belongs to us’.