A file with .usd extension is a universal scene description file format that encodes data for the purpose of data interchanging and augmenting between digital content creation applications.
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Portable document format (PDF) is a type of document created by Adobe back in 1990s. The purpose of this file format was to introduce a standard for representation of documents and other reference material in a format that is independent of application software, hardware as well as operating system. PDF files can be opened in Adobe Acrobat Reader/Writer as well in most modern browsers like Chrome, Safari, Firefox via extensions/plug-ins.
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