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A book is a medium for recording information in the form of writing and images, typically composed of pages that are bound together and protected by a cover.Free pdf books

The technical term for this physical arrangement is codex. A single sheet in a codex is a leaf, and each side of a leaf is a page. In the history of hand-held physical supports for extended written compositions or records, the scroll dominated the written world prior to the codex.

The book has dual restricted and unrestricted definitions. In the restricted sense, a book is a self-sufficient section or part of a longer composition. The usage reflects the fact that, in antiquity, long works had to be written on several scrolls, and each scroll had to be identified by the book it contained. An example includes Aristotle’s Physics in which each section is called a book. In the unrestricted sense, a book is the compositional whole of which such sections, whether called books or chapters or parts, are parts.

The content in a physical book need not be a composition. Books can consist only of drawings, engravings, photographs, and other visual arts.Free pdf books

Some physical books are made with pages thick and sturdy enough to support other physical objects, like a scrapbook or photograph album. Books may be distributed in electronic form as e-books and other formats.

What is PDF?

The Portable Document Format (PDF) is a file format developed by Adobe in the 1990s to present documents, including text formatting and images, in a manner independent of application software, hardware, and operating systems. Based on the PostScript language, each PDF file encapsulates a complete description of a fixed-layout flat document, including the text, fonts, vector graphics, raster images and other information needed to display it. PDF was standardized as ISO 32000 in 2008, and no longer requires any royalties for its implementation.

PDF files may contain a variety of content besides flat text and graphics including logical structuring elements, interactive elements such as annotations and form-fields, layers, rich media (including video content) and three dimensional objects using U3D or PRC, and various other data formats. The PDF specification also provides for encryption and digital signatures, file attachments and metadata to enable workflows requiring these features.