This document discusses digital libraries. It begins by defining a digital library as a collection of information stored in digital formats and accessible over a network. The first digital library, Project Gutenberg, was introduced in 1971 and focuses on digitizing public domain books. Digital libraries offer advantages like unlimited access from any location and preservation of materials, but also have disadvantages like copyright issues and high initial costs. The document then discusses online publication, including how it allows content to be distributed electronically without physical copies, and how academic publishing is transitioning from print to digital formats.