Vegans are people who are opposed to the needless harming and killing of animals. Veganism is an ethical stance against animal exploitation and a recognition of the rights of animals not to be property and not to be harmed or killed for no good reason.
In practical terms, that means not eating, wearing or using animal products and products tested on animals. Vegans don't use things like meat, dairy, eggs and leather.
Veganism is something that we can all do today to help animals, and it's really easy (especially with this list of what to buy, where to eat and vegan recipes!)