The study reviews smart libraries in terms of: the concept and definition, the requirements for creation and composition, the philosophy of use, smart technologies in libraries, and the trends of modern technologies in smart libraries, which are represented in the management of electronic resources, the Internet of things and its tools, data mining, artificial intelligence, ambient intelligence, Blockchain technology, augmented reality, QR code, and smart technologies for books in libraries. The study found that libraries keep pace with advances in information and communication technologies, and change their way of information processing in terms of storage, organization, dissemination or publication, and constantly reach new models. Also, smart libraries are not only a new way to provide interactive and innovative services but also a dynamic mechanism to increase the user base. The study recommends that the concerned authorities, on smart libraries and their many aspects, should conduct more studies and looking for experiences to benefit from previous experiences and avoid falling into the technical problems and other obstacles. Also, traditional libraries should think about building services, educating users, and training librarians if they want to transform into smart libraries through strategic design and implementation of advanced technologies.