Like the GIF (that's Graphics Interchange Format), the PDF (Portable Document Format) has survived and flourished through the digital age. That's partly because of its versatility: It's the go-to ...

PDF files have the option to let you share and comment on documents in a wide range of applications. Adobe Acrobat Reader and other free PDF programs offer a subset of the capabilities of the paid ...

A PDF file is one of the most widely used document types. It can be shared across multiple platforms, compressed into a smaller size easily, and cannot be edited without leaving a digital footprint.