There are three ways to address people in Spanish:

Tú form: informal speaking (most common)

Tú comes la zanahoria. - You eat the carrot.
Tú juegas con la silla. - You play with the chair.

usted form: formal speaking

Usted está contento. - You are happy.
Usted tiene gripe. - You have a cold.

vos form: informal speaking

Vos cantás en la ópera. - You sing in the opera.
Vos jugás muy bien el futbol. - You play futbol very well.

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