by 
The Curious Bag
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The age of paperless work environments began more than 10 years ago with a company named Adobe that created an environment for creating, using, and viewing Portable Document Format (PDF) files, now the standard format for Internet publication. Adobe Reader opens these files.
Main Function
Adobe Reader's most common function is to open PDF files for viewing. Adobe Reader cannot be used to create PDFs.
Other Functions
Aside from allowing the viewing of PDFs, Adobe Reader allows form entries and the ability to print. It does not, however, allow a user to save any changes made with form entries.
Common Uses
Common uses for Adobe Reader are for viewing Internet publications, such as articles, webzines, documentation and any other document that a creator would prefer to be unalterable by readers.
History
The first version of PDF was created in 1991; the corresponding Reader for PDFs at the time cost $50. Since then Adobe has updated PDF and Adobe Reader versions several times, and Adobe Reader is now available for free from Adobe's website (though PDF creation programs are not).
Popularity
According to cnet, Adobe Reader is one of the top 10 most downloaded programs of the past decade for its ability to enable Internet publishing
Source:
SoftPedia: Download Adobe Reader 9.3
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