Here's a breakdown:
* Vas: This is the second person singular present tense form of the verb "ir" (to go). It literally means "you go".
* a: This is the preposition "to".
* ir: This is the infinitive form of the verb "to go".
Together, they form the future tense, meaning an action that will happen in the future.
Example:
* ¿Vas a ir al cine? (Are you going to go to the cinema?)
* Sí, voy a ir. (Yes, I am going to go.)