The terms volunteering, volunteerism and voluntary activities is understood to be “a wide range of activities undertaken of free will, for the general public good, for which monetary reward is not the principal motivating factor” (A/RES/56/38). Social scientists, psychologists and social policymakers have long studied volunteerism as a universal social practice. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.