Abstract
A broad definition of the sector and the specific, legal and main organizational features of nonprofit organizations are presented. The origins, basic structures and relationships with the economic and public sector are described. The chapter addresses the three basic functions of nonprofits governance, central administration and programs. A specific section to International Organizations is provided. The chapter also presents the relationship to the sovereign state in different countries.
Keywords: Definition of nonprofit organizations, legal status, relationship with economic and public sectors, international organizations, structure.