Reference database refers to the database containing the original sources and attributes of various information, data or knowledge. Records in the database are secondary documents formed by reprocessing and filtering information, data or knowledge (such as cataloging, indexing and classification). The records in the database are formed by reprocessing and filtering data, information or knowledge, such as cataloging, indexing, summarizing and classifying.
Bibliographic database mainly reports and reveals the contents and storage addresses of books, such as machine-readable catalog database in library collections; The index database is related to periodical papers, conference papers, patent documents and dissertations. They provide clear information about the source of documents for people to consult and search, but generally do not provide information about the collection of original documents.