This paper intends to describe the concepts and historical development of information resources in the digital library, to analyze the different types and characteristics of electronic information resources, and to comment the cases of electronic information resources-especially electronic books, electronic journals, and electronic newspapers. Over the centuries, since the introduction of the printing press, conventional books have played a fundamental role in a wide range of information dissemination and knowledge transfer activities. But, I have mentioned some of limitations of conventional books and electronic information resources in this article. In order to overcome some of them, I think that we should introduce the idea of electronic information resources as a means of storing, sharing and communicating large volumes of dynamic multimedia information.