Spanish Language Stack Exchange is a question and answer site for linguists, teachers, students and Spanish language enthusiasts in general wanting to discuss the finer points of the language. It only takes a minute to sign up.
I understand both often translate to English as "what" or "which" and "that", respectively.
My professor told me that cual is often used when presented with a choice while que is used when asked to explain something. However it seems that these reasons often apply to the same instances. Please let me know if there is an easier way to figure out when to use these two words.