This document discusses digital libraries and metadata. A digital library is an organized collection of digital objects like text, images, video and audio that allows users to access and retrieve materials. Key components include the initial conversion of physical content to digital form, a client interface for browsing, and content delivery via networks. Metadata, or data about data, is crucial as it allows users to locate, use and process digital content through descriptive, structural and administrative metadata. Semantic technologies can enhance digital libraries by enabling search and browsing based on semantic concepts and supporting user communities.