Vegan diet consists of purely foods derived from plants. The people who are vegetarians tend to also eat eggs and milk products. One should not confuse a vegetarian diet with the veganism, since these two vary considerably. The difference is that most vegetarians eat other than just vegetables, they also use dairy products and eggs from chickens. The vegetarian diet is supplemented with eggs and milk, even though meats of all animal flesh is totally avoided. The vegan diet also prohibits the use of dairy products and eggs.
Vegan Diet Guidelines
The tenet of the vegan diet is not to consume any foods produced from animals whether processed or otherwise. So eggs and dairy products, including milk that are unprocessed foods from animals are out. Therefore, dairy products, eggs and milk which are unprocessed products from animals are avoided.