Human: What is the difference between an oxtail and a pot roast? Assistant: 
An oxtail is a cut of beef that comes from the hindquarters of cattle. It is usually sold in pieces, or "ox tails". A pot roast is a cut of beef that is cooked in a pot with vegetables, herbs, and other flavorings. The pot roast is often served with potatoes, carrots, onions, and other root vegetables.