It's a question used to ask if someone possesses something.
Here's the breakdown:
* Tienes: This is the informal form of "you have" (the verb "tener" conjugated for "you")
* Tú: This is the informal pronoun "you"
Example:
* ¿Tienes tú un coche? (Do you have a car?)
Note: In Spanish, "tú" is often omitted in everyday conversation. So you could also say:
* ¿Tienes un coche? (Do you have a car?)