Side by side with the paper textbooks there exist the textbooks produced in electronic format (e-books). An e-book is the digital media equivalent of a conventional printed book. Such documents are usually read on personal computers, or on dedicated hardware devices known as e-book readers or e-book devices.

Library is a collection of information, sources, resources, and services: it is organized for use and maintained by a public body, an institution, or a private individual. Libraries are integral parts of the country and nation, and indicate the human desire to preserve and collect knowledge, and progress both culturally and intellectually.