This paper discusses the role of libraries in the preservation of World Wide Web publications. Topics addressed include: (1) the scope of Web preservation, including examples of projects that illustrate comprehensive and selective approaches; (2) the responsibility of Web preservation, including placing the responsibility on publishers and other institutions, the national approach, and the international approach; (3) challenges of Web preservation, including information retrieval, the short life span of Web publications, and lack of a legal framework for Web preservation and access; (4) preservation of digital information, including different digital formats and conversion of document files to readable formats; (5) the present situation of Web archiving in the world, including examples of several projects. (MES)