1. The document introduces digital libraries, which organize digital objects like text, images, video and audio along with methods for access, retrieval, selection, organization and maintenance. 2. Key components of a digital library include converting physical content to digital, extracting metadata, storing content and metadata in a repository, and providing client services for browsing and delivering content. 3. A digital library manages digital objects which can have complex structures and relationships, and groups of objects represent the information in the digital library.