Pho is a Vietnamese noodle soup dish that originated in Hanoi, Vietnam. It consists of rice noodles in a clear broth, often served with beef or chicken, and topped with green onions, cilantro, and lime wedges. The name "pho" comes from the French word for "fire," which is how the dish was originally cooked - over an open flame. Pho has become a popular dish worldwide and is often considered one of Vietnam's national dishes.