A PDF book is an electronic document that contains text, images, and other elements formatted in the Portable Document Format (PDF). This file format was created by Adobe Systems in 1993 and has since become a widely used standard for document exchange and distribution. PDF books can vary in length from a few pages to hundreds or even thousands of pages, depending on the content and purpose of the book. They can be created from a variety of sources, including word processing documents, images, a
