Digital textbooks continue to hold the potential to revolutionize the dissemination of knowledge to anyone, anywhere. The understanding needed to reach a new digital paradigm includes tools that are consistent with the needs of a new generation of educators and students. This study provided a foundation that defines the function, structure, and role of the textbook in education. The textbook is defined as a basic educational resource that provides definitive knowledge, defines and bounds the scope of discussion and learning, and helps assure that the stated learning goals are met. A textbook is an educational resource that contains other resources, functions as the principal resource in educational workspace. As is the role of the best technology, a fully functional digital textbook seamlessly encapsulates the educational materials and resources needed by the specific course. The consideration of linear and non-linear study functions, existing devices and interfaces helps in understanding textbooks.