This document provides an overview of digital libraries, including their history and future directions. It discusses the oldest libraries in Ebla, Syria and St. Catherine's Monastery in Egypt. The largest libraries are the British Library and Library of Congress. The most beautiful include the Strahov Monastery Library and Library of Congress. Digital libraries started with a 1991 NSF workshop and the Digital Library Initiative in the 1990s. Today digital libraries include the Library of Congress, university libraries, and commercial search engines. Future challenges include preserving all digital content, ensuring accessibility, and addressing issues like intellectual property, privacy and archiving.