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PDF stands for Portable Document Format. It is often used on the Internet for documents that need to retain a certain layout which can be difficult to do using HTML. On Wikianswers, (PDF) is sometimes written after a link to warn the reader that clicking it will open this sort of document. The link itself automatically displays the document icon next to it () but for large files, it is useful to provide additional notice for people that do not know what the icon means.