The word oral means having to do with the mouth or speaking. When you give an oral report in school, you stand in front of the class and talk.
Use the adjective oral to describe something that's spoken aloud, like an oral exam or an oral history passed between generations through bedtime stories. Oral is also good for referring to other things you do with your mouth — your dentist may drive you crazy talking about "oral hygiene," or keeping your teeth clean. The roots of the word oral go back to the Latin word for "mouth," which is os.