Question: How can I tell if a data modeling task is either supervised or unsupervised? Regression or classification? I was also wondering for example in classification

How can I tell if a data modeling task is either supervised or unsupervised? Regression or classification? I was also wondering for example in classification if my y = yes or no and I have multiple predictors(X1, X2, X3, X4) does the number of classes come from y or the predictors?

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