I’ve been asked to explain what PDF, ZIP and RTF files are used for. PDF means Portable Document Format, which is a file type traditionally created with Adobe Acrobat. Acrobat produces documents that ...

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?<BR><BR>they say "Quartz enables on-the ...