A "modal" refers to a type of auxiliary verb used in English to express ability, possibility, necessity, or permission. Common modals include can, could, may, might, must, and should. These verbs help convey the speaker's attitude toward the action of the main verb, indicating how likely or necessary it is. In addition to verbs, "modal" can also describe a category of music or a type of logic. In music, a modal scale is based on a specific pattern of intervals, creating distinct sounds. In logic, modal logic explores concepts of necessity and possibility, expanding traditional logical frameworks.