PDF (Portable Document Format) is a proprietary format designed by Adobe. Viewers are available for almost every device so anyone can open a PDF for viewing or printing.
PDF has been extremely successful in the desktop publishing and print business as designers and authors can create documents that can be sent globally. More recently PDF has become a popular ebook format too. A shared PDF can be printed or viewed with custom fonts, drawings and layouts faithfully reproduced. The original program does not have to be on the device the document is sent to.
Many office and drawing programs can make PDF files including Microsoft Office and Adobe Photoshop. Others use PDF printer drivers to do the same thing.
PDF documents are meant to be 'read-only' but many people wish to edit PDFs sent to them. Adobe Acrobat designed by Adobe is able to do this but Adobe Illustrator, Scribus and Libre Office can open PDF multi-page documents, edit and export PDF files.
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