An avocation is an activity that a person does as a hobby outside their principal occupation. There are many examples of people whose profession was the way they made a living, but whose activities outside their workplace were their true passion in life.
Many times a person's regular vocation may lead to their avocation. Many forms of humanitarian campaigning, such as work for organizations such as Amnesty International and Greenpeace may be done by people involved in the law or human rights issues as part of their work..
Many people involved with youth work pursue this as an avocation.