Many content creation applications, such as Microsoft Word, Adobe InDesign, or Adobe Photoshop, allow users to define metadata for its files. Professional content management systems can not just display metadata but also allow for extensive searches based on the keywords or description field. Theoretically operating systems should also be able to do this but while an operating system like Windows 7 is great at showing picture related metadata (such as the resolution, bit depths, keywords.) or music-related metadata (such as the artist, album, and genre), it fails to do so for PDF files. Adobe Bridge, for example, allows you to browse through folders containing PDF files and check basic metadata such as the author, description, and copyright of PDF files. Applications geared towards managing libraries of data can show metadata.
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