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 ...

I don't understand how it works or what exactly PDF actually IS. All I know is that it is basically an image format. Why does OS X use it and how does it use it? they say "Quartz enables on-the-fly ...

Portable Document Format files, also known as PDFs, are universally used during electronic document exchanges. This file format is often preferred when users need to share, store, or print documents ...