An imaging file format technology developed by Adobe Systems. PDF captures formatting information from a variety of applications in such a way that they can be viewed and printed as they were intended in their original application by practically any computer, on multiple platforms, regardless of the specific application in which the original was created. PDF files may be text-searchable or image-only. Adobe® Reader, a free application distributed by Adobe Systems, is required to view a file in PDF format. Adobe® Acrobat, an application marketed by Adobe Systems, is required to edit, capture text, or otherwise manipulate a file in PDF format..”