Phở is a Vietnamese noodle soup consisting of broth, linguine-shaped rice noodles called bánh phở, a few herbs, and meat. It is a popular street food in Vietnam and the specialty of a number of restaurant chains around the world. Pho is primarily served with either beef or chicken. The Hanoi and Saigon styles of pho differ by noodle width, sweetness of broth, and choice of herbs.