This is what Adobe, the software compnay that designed the PDF, states about the software.
PDF is the file format that underlies the Adobe® Intelligent Document Platform, facilitating the process of creating, managing, securing, collecting, and exchanging digital content on diverse platforms and devices. The Intelligent Document [FONT=EDJON P+ Minion Pro,Minion Pro]Preface [/FONT][FONT=EDJOJ M+ Myriad Pro,Myriad Pro]24
[/FONT]Platform fulfills a set of requirements related to business process needs for the global desktop user, including:
[FONT=EDJOK N+ Minion Pro,Minion Pro]•[/FONT]Preservation of document fidelity across the enterprise, independently of the device, platform, and software
[FONT=EDJOK N+ Minion Pro,Minion Pro]•[/FONT]Merging of content from diverse sources—Web sites, word processing and spreadsheet programs, scanned documents, photos, and graphics—into one self-contained document while maintaining the integrity of all original source documents
[FONT=EDJOK N+ Minion Pro,Minion Pro]•[/FONT]Real-time collaborative editing of documents from multiple locations or platforms
[FONT=EDJOK N+ Minion Pro,Minion Pro]•[/FONT]Digital signatures to certify authenticity
[FONT=EDJOK N+ Minion Pro,Minion Pro]•[/FONT]Security and permissions to allow the creator to retain control of the document and associated rights
[FONT=EDJOK N+ Minion Pro,Minion Pro]•[/FONT]Accessibility of content to those with disabilities
[FONT=EDJOK N+ Minion Pro,Minion Pro]•[/FONT]Extraction and reuse of content using other file formats and applications
[FONT=EDJOK N+ Minion Pro,Minion Pro]•[/FONT]Electronic forms to gather data and integrate it with business systems.