Examples of binary classification problems:
Will the customer buy this product or not buy this product?
Is this email spam or not spam?
Is this product a book or a farm animal?
Is this review written by a customer or a robot?
Examples of multiclass classification problems:
Is this product a book, movie, or clothing?
Is this movie a romantic comedy, documentary, or thriller?
Which category of products is most interesting to this customer?
Examples of regression classification problems:
What will the temperature be in Seattle tomorrow?
For this product, how many units will sell?
How many days before this customer stops using the application?
What price will this house sell for?