Pho consists of broth, rice noodles, herbs and can be made in a number of different variations. The main sauces that many people add to their Pho is called Hoisin Sauce as well as Sriracha which is a type of Chili sauce. Other than different meats, extras such as tendon, tripe and brisket can be added. The main types that are found in local restaurants include:
Pho Bo (Beef):
The traditional beef noodle soup that consists of raw lean beef that will cook while in the soup.
Other variants of Beef can include: Pho Bo Vien (Beef Meatballs), Pho Chin (Beef Brisket) and Pho Tai (Sliced Steak)
Source: http://www.myrecipes.com/recipe/beef-noodle-soup-50400000129465/