Indefinite Pronouns in Finnish grammar are used to refer to non-specific persons, things, or amounts. They can function as subjects, objects, or complements in a sentence. Some examples of indefinite pronouns in Finnish include joku (somebody/someone), jokin (something), kukaan (nobody/no one), and mikään (nothing). These pronouns are essential for expressing non-specific or general ideas in Finnish, and mastering them will greatly improve your language skills.