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PDF (Portable Document Format) is a widely-used file format for sharing documents consistently across platforms. Adobe developed PDF; other tools like Nitro PDF, Foxit Reader, Smallpdf, and PDF24 help create, edit, and compress PDFs. Adobe Acrobat is a leading PDF software, while PDF.js enables viewing PDFs in browsers. OCR (Optical Character Recognition) converts scanned images into editable text. Standards like ISO 32000 specify PDF specifications, with PDF/A for archiving and PDF/X for printing. PDFs include forms and support compression algorithms. Organizations like W3C set web standards; services like DocuSign facilitate secure e-signatures. Universities, including Calgary, utilize PDFs for academic materials and digital management.