PDF, GUI (Graphical User Interface), Adobe Acrobat, Foxit Reader, PDF.js, LaTeX, Microsoft PDF Reader, Nitro PDF, PDF/A, ISO 32000, XML Paper Specification (XPS), OpenDocument, digital documents, electronic publishing, document management, PDF compression,

PDF (Portable Document Format) is a widely used file format for sharing documents that preserve formatting across devices. GUI (Graphical User Interface) is the visual interface allowing users to interact with software easily. Adobe Acrobat and Foxit Reader are applications for viewing/editing PDFs; PDF.js is a web-based PDF viewer. LaTeX is a system for creating professional documents. Other tools like Nitro PDF support PDF management. PDF/A is a standard for long-term archiving. ISO 32000 is the official PDF specification. XPS and OpenDocument are alternative document formats, while digital documents enable efficient electronic publishing, management, and compression for easier storage and sharing.