"Nonprofit" and "Not-For-Profit" are terms used to describe careers in which people seek to:

make changes to existing social systems; or

provide for the social, spiritual, physical, mental, educational, and/or cultural needs of a given population.

Nonprofits come in every shape and size and include the following types of organizations:

Private education
Social services
Arts and humanities
Civic and public groups
Social causes
Foundations
Labor unions
Religious
Think tanks/public policy
Scientific & research
Health services
Youth leadership & development
Professional and trade associations