1, PDF is a portable document file format, which is used to present and exchange documents reliably, whether it is software, hardware or operating system. PDF was invented by Adobe and is now an open standard maintained by the International Organization for Standardization (ISO). PDF can contain links and buttons, form fields, audio, video and business logic. They can also sign their names electronically and view them easily by using the free Acrobat Reader DC software.

2. 199 1 year, Dr. John Warnock, the co-founder of Adobe, initiated the paper-to-digital revolution with the idea he called Camelot Project. The goal is for anyone to get documents from any application, send electronic versions of these documents anywhere, and view and print them on any computer. By 1992, Camelot has developed into a PDF. Today, it is a trusted format for enterprises all over the world.

3.PDF files can contain not only images and texts, but also interactive buttons, hyperlinks, embedded fonts, videos and so on. You will often see product manuals, e-books, leaflets, job applications, scanned documents, brochures and various other documents in PDF format. Because PDFs do not depend on the software that created them, nor on any specific operating system or hardware, they look the same no matter what devices are turned on.