Having a bit of a cultural shock at how English doesn't have a separate name for the "cruder" graffiti (such as tags) vs the more socially accepted street art. The former is typically called "pichação" [1] in Portuguese, and I was taught this distinction when learning about modern art movements back in elementary school.

[1] https://pt.wikipedia.org/wiki/Picha%C3%A7%C3%A3o - I recommend looking into a machine translated version of the Portuguese Wikipedia article, as the English Wikipedia article reads far more biased