Question:
What is the difference between PDF and PDF/A?

Answer:
Good question. PDF/A is a special kind of PDF. In contrast to the common PDF, the PDF/A ISO standard is defined for long-term archiving. Essentially, PDF/A identifies a ‘profile’ for electronic documents that ensures the documents can be reproduced in years to come. It offers users a way for representing electronic documents in a manner that preserves their visual appearance over time, independent of the tools and systems used for creating, storing or rending the files.

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