The UNESCO Digital Library is the repository of UNESCO’s institutional memory and a source of high-quality information on UNESCO activities (in education, natural sciences, social and human sciences, culture, and communication and information), with more than 350,000 documents dating back to 1945. It includes the collections of the UNESCO Library and several documentation centres in UNESCO’s Field Offices and Institutes, as well as the UNESCO Archives. The essential purpose of the UNESCO Digital Library is to share knowledge and to transmit it to future generations.