PDFs run your world. You know you use PDFs to make your most important work happen. That's why we invented the Portable Document Format (better known by the abbreviation PDF), to present and exchange documents reliably — independent of software, hardware, or operating system.
The PDF is now an open standard, maintained by the International Organization for Standardization (ISO). PDF documents can contain links and buttons, form fields, audio, video, and business logic. They can be signed electronically, and you can easily view PDF files on Windows or Mac OS using the free Acrobat Reader software.