This document discusses various information sources that are useful for competitive exams. It defines information and information sources, noting that information sources include books, journals, reference materials, conference proceedings, and reports. It then defines e-resources as electronic products that deliver data collections, including text databases, e-journals, images, and other multimedia accessed via CD-ROM, internet, or intranet. The document outlines different types of information sources such as printed sources like newspapers and journals, and electronic sources like webpages, websites, and online databases. It emphasizes that e-resources are now available 24/7 from desktops at home, work, or while traveling without needing to visit a library, and that the web has established itself as a