Nanjing Library is a provincial public library. Relevant public information shows that Nanjing Library is a provincial public library in Jiangsu Province, the first batch of national key protection units of ancient books, a national first-class library, and a document resource guarantee center in Jiangsu Province. Nanjing, referred to as "Ning", was called Jinling and Jiankang in ancient times. It is a prefecture-level city, provincial capital, sub-provincial city, megacity and core city of Nanjing metropolitan area under the jurisdiction of Jiangsu Province. It is an important central city in eastern China, an important scientific research and education base in China, and a comprehensive transportation hub approved by the State Council.