What is PDF?
Adobe Portable Document Format
Adobe Portable Document Format (PDF) lets you capture and view robust information—from any application, on any computer system—and share it with anyone around the world. It invented by Adobe Systems and perfected over 15 years.
Open format — De facto standard for more secure, dependable electronic information exchange—recognized by industries and governments around the world.
Multiplatform — Viewable and printable on any platform — Macintosh, Microsoft® Windows®, UNIX®, and many mobile platforms.
Trusted and reliable - More than 200 million PDF documents on the web today serve as evidence of the number of organizations that rely on Adobe PDF to capture information.
Searchable — Leverage full-text search features to locate words, bookmarks, and data fields in documents.
Accessible — Adobe PDF documents work with assistive technology to help make information accessible to people with disabilities.
Use Adobe Reader to view, search, digitally sign, verify, print, and collaborate on Adobe PDF files.
Download it here: http://www.adobe.com/products/acrobat/readstep2.html