Vos is used extensively as the primary form of the second person singular in Argentina...
Use the pronoun vos reflecting the informal address in Spanish as opposed to the formal address of usted.
The independent disjunctive pronoun ti is also replaced by vos. That is, vos is both nominative and the form to use after prepositions
The preposition-pronoun compound contigo "with you" becomes con vos.
che vos, vení acá = Hey you, come here.
In Argentina, the word "vos" replaces "tú" in almost all contexts of dialogue.
Both "vos" and "tú" are friendly uses of english word "you". The formal translation from the english "you" is "usted".
"Che, vos, de dónde sos?" = "Hey, you, where are you from?"