Supervised learning is where you have pairs of training observations that are the data and their corresponding labels. So there's that general classification. The other types of machine learning problems you have, for example, regression. You want to predict the price of a house and you know the number of square feet, you know theNumber of rooms,. And so you have a bunch of variables that describe your house or apartment. From this you want to predictions the price. It's not binary. This is what people call regression.