How common is the "vos" pronoun and verb form in Spanish?

Like can I say ¿Me podés decir lo que pasó? instead of ¿Me puedes decir lo que pasó? or if I say "¿De dónde sos? instead of "¿De dónde eres?" When should I use the vos form? Is it only used in certain countries? Would someone who is from a country where they don't really use it know what... show more Like can I say ¿Me podés decir lo que pasó? instead of ¿Me puedes decir lo que pasó?
or if I say "¿De dónde sos? instead of "¿De dónde eres?"

When should I use the vos form? Is it only used in certain countries? Would someone who is from a country where they don't really use it know what I'm saying if I do use it?
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