Portable Document Format (PDF) is a document file format developed by Adobe primarily designed to facilitate the distribution and archival of content. You can think of a PDF file as an uneditable Microsoft Word document.
You can read more about what PDF is and what it is used for on Adobe's website and on Wikipedia's PDF entry.
PDF has become an indispensable tool for distributing and archiving documents, but it can be difficult to integrate PDF documents into existing data processing systems. Our PDFTextStream product aims to make this integration possible and easily attainable.