This document discusses line agencies, staff agencies, and auxiliary agencies in public administration. Line agencies deal directly with the public and fulfill the primary objectives of the government, such as health, defense, and education. Staff agencies act as extensions of the chief executive and cabinet to provide advice and information to line agencies. Auxiliary agencies support line agencies by providing necessary supplies and services, such as construction work and procurement. The key differences are that line agencies directly implement programs, staff agencies advise, and auxiliary agencies provide support services.