Usually volunteers work unsolicited, while their assignments are unpaid and geared to the general well-being. Their areas of assignment include associations like sports clubs and cultural associations, various social sectors, charities or church organisations, initiatives founded by citizens or schemes abroad, like development aid projects.
Those who work full-time and those who work voluntarily are brought together by their goals and complement each other in their organisations. Full-time employees have a funded employment including the benefits of social security. Full-time employees may work for an authority or for agencies, in schools, at universities or in research institutions. They perform mandatory tasks of public authority and those tasks are financed. Furthermore, some institutions, especially schools and universities, have to fulfil an educational task.
Example: school administration (with an educational task)
Voluntary involvement may refer to any voluntary act which is carried our free of charge and for the benefit of others or the public. Volunteer helpers nonetheless work target-oriented and support the work of full-time employees. They may be active in all kinds of fields (i.e. board of a child day care centre, involvement in nature protection, lay judge, assistance in social projects). In contrast to full-time employees the educational task is not as central and no “job requirement”: Everybody who wants to help can help.
Example: voluntary board member of a school (with an educational will)