PERSONAL PRONOUNS

The personal subject pronoun is used to replace the noun. Tú is the singular familiar version of you.  Vosotros is the plural form all of you.  Usted is the formal or polite form of you, ustedes is the plural version.  Tú would be used with family, friends, and anyone you were to feel familiar with.  Usted is the more formal version used to show respect.