What is "Section 508" very very simply?
accessibility, section508
Solution
A fairly simple explanation can be found here; summed up nicely by this snippet:
Section 508, an amendment to the United States Workforce Rehabilitation Act of 1973, is a federal law mandating that all electronic and information technology developed, procured, maintained, or used by the federal government be accessible to people with disabilities. Technology is deemed to be "accessible" if it can be used as effectively by people with disabilities as by those without.
This page also offers another good, simple explanation:
Section 508, in simple terms, requires that when Federal Agencies develop, procure, maintain or use electronic and information technology, information and data should be accessible to people with disabilities.
Obviously there's lots more involved in this process, but you already knew that. Hopefully this clarifies things a little bit!
Problem
I researched at google and found many confusing, looooong explanations for Section 508! made me even more confused. very simply, what is this Section 508?