Uruguayan Spanish or Uruguayan Castilian (Spanish: Español uruguayo o castellano uruguayo) is Spanish variety spoken in Uruguay and by the Uruguayan diaspora. Uruguayan Spanish is rioplatense Spanish but it differs with the rioplatense spoken in Argentina in a few words. For example, "championes" instead of the Argentine word "zapatillas".
Strong influence of Italian and its dialects because of the big Italian communities (Montevideo and Paysandú). The platinean "tonada" (the way of speaking the language) is very different compared to other Latin American countries and Spain because it's very similar to Italian. There are many Italian words incorporated in the language (nona, cucha, fainá, chapar, parlar, festichola, etc.) and of Italian derivation (for example: mina derivated from femmina, or pibe from pivello).
In Montevideo, and the whole south region, the "tú" pronoun is changed by the "vos" pronoun with an acute accent verb conjugation. In the rest of the country "tú" is very used, instead of "vos". In some cases "tú" is used, but with the corresponding conjugation to "vos", like: "tú tenés", instead of "tú tienes" or "vos tenés".
However, "usted" is used in very formal contexts, for example when speaking to government authorities.