A good overview of PDF/UA for the layman has been published on the University of Illinois, Chicago website. It provides some of the history behind it and explains why PDF/UA is needed.
“…when you are developing PDF files using tools, make sure the PDF tools you buy and use support PDF/UA,” writes Kevin Price. “You will no longer have to shut out the needs of people with disabilities in the development of your PDF file if you use PDF/UA accessibility standards.”
Country of Origin: United States
Source: University of Illinois, Chicago