Database - “A database is a collection of related data that is stored on a computer and organized in a manner that enables information to be retrieved as needed. A database management system (DBMS) – also called database software – is the type of program used to create, maintain, and organize data in a database, as well as to retrieve information from the database.”Taken from: PINARD, Nicole Jones and ROMER, Robin M. (2012). CMPTR. Student ed. Boston, MA: Course Technology, Cengage Learning, p. 98.
In the light of this definition, Library databases store and organise data about print and electronic publications, sometimes including the full text of those publications, e.g. books, theses, journals, law reports, according to certain professional cataloguing, indexing and abstracting rules. The rules according to which the data is arranged in the database, e.g. by author, by editor, by title, by date, by subject, makes it easy to retrieve relevant information.