Image taken from Etnies.com
While the true definition can vary on a case by case basis, the general consensus is that a vegan is a strict vegetarian. This means that the vegan will not consume animal flesh, fish, fowl, dairy proudcts or eggs. Depending on their level of commitment and the philosophy behind it, they may choose to abstain from consuming honey, royal jelly, pollen and/or any other bee/insect-related products.
However, depending on their ethics, vegans may not limit only their diet in its consumption of animal products, but they may also decline to wear, buy or otherwise use products made from animals such as clothing (including fur, wool and silk), shoes (leather, suede etc) cosmetics and household items.
Politics and philosophies behind why a person will decide to become vegan, these can include animal rights reasons, environmental reasons, and simply health reasons.
Why are you a vegan?