Veganism is often referred to as an extreme form of vegetarianism, though many of its practitioners don’t find it to be extreme at all. Vegans commit to plant-based living, eschewing the use of animal products.

As in a vegetarian diet, vegans avoid meat in their diets, as well as foods like eggs, cheese, honey, and whey. Those dedicated to a strict vegan lifestyle will also shun animal products in clothing as well, avoiding leather, fur, silk, and wool.

More Info: en.wikipedia.org