Have you ever tried to send a document to someone, only to find that it can’t be read on her system? Dealing with compatibility issues across software products and different systems can be a nightmare. The Portable Document Format (PDF or .pdf), is easily read by any computer system and used extensively on the Web. If you don’t have a PDF viewer (Adobe’s is called “Reader”), you can download one free. Many web designers use Acrobat to create their PDF files, add forms to their websites, and add a reviewing/commenting system to multiple-page documents. Additionally, designers and printers can use Acrobat 8.0 Professional to preflight and touch up files for final printing.