National epics are lengthy narrative poems that are central to the cultural identity of a nation. They often recount the history, values, and beliefs of a society through heroic characters and significant events. Examples include the Iliad and Odyssey from ancient Greece, and the Mahabharata and Ramayana from India. These epics serve not only as literary works but also as a means of preserving traditions and moral lessons. They reflect the struggles and triumphs of a people, often highlighting themes of honor, bravery, and sacrifice. National epics can inspire unity and pride among citizens, reinforcing a shared heritage.