Indefinite pronouns in Catalan grammar refer to non-specific people, things or even quantities. These pronouns do not provide specific information, so they are called “indefinite.” They represent a person, object or amount without specifying the exact one. Some common indefinite pronouns in Catalan are: algú (someone), alguna cosa (something), tot (all), res (nothing), and molts (many). Developing a good understanding of indefinite pronouns is essential to achieving proficiency in Catalan.