An extension agency is an organisation that practises extension, in the context of community development. Community development, informally called Community building, is a broad term applied to the practices and academic disciplines of civic leaders activists involved An example is the Cooperative Extension Service, which aims to assist individuals or groups in defining and achieving their goals in rural communities in the USA. The Cooperative Extension Service, also known as the Extension Service of the USDA, is a non-formal educational program implemented
Extension agents are trained in the skills of extension, such as communication and group facilitation, and usually in technical areas of the sector they serve (for example agriculture, health, or safety). Agricultural extension agencies promote more profitable and sustainable farming, while health extension agencies promote improved health. Agricultural extension was once known as the application of scientific research and new knowledge to agricultural practices through farmer education
Extension agents are represented by professional organisations such as the Australasia-Pacific Extension Network and publish in journals such as the Journal of Extension.