Due to advancements in information technology, variety of information needs and decreasing budget, the paradigm has shifted from traditional library to library modern digital that has a collection of digital information with special features and a variety of information services. Libraries have migrated and updated their collections and services in the form of digital collections and services. Digital libraries offer to preserve, archive and provide access to digital content for present and future use. This article describes the definition, functionalities, prerequisites, procedures, tools and software of digital libraries. He concludes with the remarks that library and information science professionals should take advantage of the new opportunities offered by digital libraries.Keywords: Digital library, Prerequisites, procedures, DL infrastructure, collection and servicesINTRODUCTION:The library is considered as an institution whose basic responsibility is to preserve books and make them accessible to those who are interested in them.1 The fundamental characteristic of a good library is its complete identification with its institution, the measure of its excellence is the extent to which its resources and services support the academic activities of the institution.2The fundamental objective of any library is to acquire, store, organize and disseminate information and knowledge in a variety of files and formats. The increase in the variety of information needs, the nature of publications and the structure of the library has created complexity in library functions and management, which has transformed the work of the librarian as a manager information or knowledge instead of that of bookstore storekeeper. “The world is... middle of paper...... meeting the needs of target users. Manpower: Staff are required for the creation, organization and management of the digital library. The professional may be trained in library science with a background in computer science and have mastery of digital collection development and services are required for this. IT Infrastructure (Hardware, Software, Connectivity) Infrastructure is required for the development of the digital library as follows: Hardware ( select as required) Server: Web server, file server, mail server, etc. Nodes: computers, laptop, pocket computerPrinter: linear printer, laser printer, inkjet printerScanner: flatbed and overhead (Minolta PS 7000, Zeutschel)Digital camera: Fixed digital camera, Canan (3-5 Mp)Video camerasMachine audio recordingSoftware (select as needed)System Software - Vista, Windows XP, Linux, Unix, Mackintosh, Win2003