Electronic resources represent an increasingly important component of the collection- building activities of libraries. "Electronic resources" refer to those materials that require computer access, whether through a personal computer, mainframe, or handheld mobile device. They may either be accessed remotely via the Internet or locally. Some of the most frequently encountered types are:
E-journals
E-books
Full-text (aggregated) databases
Indexing and abstracting databases
Reference databases (biographies, dictionaries, directories, encyclopaedias, etc.)
Numeric and statistical databases
E-images
E-audio/visual resources