E-book is certainly a new form of book whose development has enabled the development of technology. Given the small percentage of e-books in relation to the entire publishing industry, we can say that the development of these services is in its infancy, especially since concerns e-books in libraries. In this paper, we will look at the theoretical starting points of the e-book - we will define the e-book, list its advantages and disadvantages, and how e-books can be evaluated. We will talk about e-lending and ways of e-lending as well as the relationship between libraries and publishers who do business with e-books. We will list the current platforms that do business with e-books in Croatia and briefly describe them. The e-book is slowly entering Croatian libraries, so it is certainly important to mention the issues of copyright, business and procurement of e-books, and property rights management. The research part of the paper refers to the digital platform for lending e-books iBiblos, which has been operating in the public libraries of the Istrian County since the end of 2018. The research was conducted on active iBiblos users in the Pula City Library. The aim of the research was to get a picture of how many active users use the platform, which literature they read the most, but also what difficulties they encountered when activating an account or application/program for reading e-books. Then they wanted to find out what are the advantages and disadvantages of iBiblos, how often they use the platform and whether it has replaced their printed book.