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Portable document format (PDF) files remain a popular choice for business documents ranging from contracts and forms to manuals and reports, so there's a good chance you need to open them often.

A PDF is a suitable file format for creating and reading e-books. However, if you want to open an e-book in most e-readers, like the Amazon Kindle and B&N Nook, you must first convert it to an EPUB.

Q: I want to save my resume in PDF format. On my sister's Macintosh computer, I can convert a Microsoft Word file to a PDF using the print command. But that's not available on my Windows computer.