The book "ChatGPT in libraries" shows the possible uses for libraries with regard to the AI bot "ChatGPT" and discusses relevant best practices for the use of ChatGPT in the library spectrum. Furthermore, potential changes in the role of librarians, impacts on library users and library structures are explained comprehensively. Ethical issues are also taken into account, which will gradually arise with use. Finally, there follows a look into the future and the associated possible future, progressive developments.