If you’ve already started Spanish language lessons with us then you have probably learned the 2nd person singular personal pronoun tú which is used in informal situations such as when speaking to friends, relatives and people you know well. 
However, if you should travel to Latin America, you are likely to encounter a different form altogether. In Argentina, you will notice that the word used for the informal ‘you’ is ‘vos’. Though you will be understood if you use tú, it is highly unlikely that you will hear anyone use it, unless of course they happen to be visiting from Spain! Vos is used in other parts of Latin America too, for example in parts of Colombia, and to a lesser extent in Venezuela, Ecuador, Chile and southern Mexico, though it is only in Argentina that it is used to the exclusion of tú.
Vos is conjugated rather differently to tú, typically taking a form where the accent is on the finally syllable with endings of -ás to the stem of ar verbs, -és for er verbs, and -í for ir verbs, dropping the stem change that comes with tú in standard Spanish. There are some irregular forms too, notably the second person of the verb ser (to be) is sos, meaning the equivalent of tú eres is vos sos.
If you are planning a trip to South America, don’t panic thinking that you need to learn all of the new forms, you will quickly pick up the way it’s used by listening to others. And if you have any questions, our native tutors will be happy to help you out.