What is a PDF? Portable Document Format | Adobe Acrobat DC
https://acrobat.adobe.com/us/en/acrobat/about-adobe-pdf.html
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 DC software.
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