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Pronouns
A pronoun is a word that takes the place of a noun (person, place or thing).
Like nouns, pronouns are used for different functions: subject or object. But unlike nouns that don't change according to function, pronouns do change according to function.
The subject pronouns are:
English:
First person singular - I
Second person singular - you
Third person singular - he, she, it
First person plural - we
Second person plural - you
Third person plural - they

The Spanish subject pronouns are:
First person singular - yo
Second person singular - tú
Third person singular - él, ella, Usted
First person plural - nosotros, nosotras
Second person plural - vosotros, vosotras
Third person plural - ellos, ellas, Ustedes

The rules for pronouns used as objects are discussed in the module on Objects.
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The Second person in Spanish
In Spanish, "you" has two meanings: it is used between people who have familiar relationships (singular "tú" and plural "vosotros" (masculine) and "vosotras" (feminine) and between people who have more formal relationships (singular usted or Ud. and plural ustedes or Uds.)- it used to be considered impolite to be addressed by the familiar inappropriately. The formal "you" - Usted or Ud. is a third person. and therefore the object pronouns are the third person pronouns.

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The subject pronouns are also used with prepositions, as discussed in the Objects section.
The exceptions to this rule are the singular first and second person pronouns:
conmigo (with me)
contigo (with you)
but:
con
él, ella, Usted
con nosotros, nosotras
con vosotros, vosotras
con ellos, ellas, Ustedes
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