What is the difference between deontic and epistemic modal verbs?

A modal verbs is a type of auxiliary verb that shows possibility or obligationAn auxiliary verb is a verb that forms the tenses or moods in a sentence "helping words"e.g. Be, do, have (I have visited Rome)Modal Auxiliaries include:can, could, may, might, must, shall, should, will, and wouldA deontic verb demonstrates necessity/obligation - so you need to complete the action e.g. You must go to school e.g. You should brush your teeth An epistemic verb shows possibility - often highlighting ability or choice to perform an action eg. you could go to school e.g., You might go to school