Section 508-Accessibility refers to section 508 of the Rehabilitation Act of 1973. It requires that federal agencies make their websites and electronic and information technology accessible to anyone with a disability in a manner that is equal to the public and non disability members.
Semantic Markup is the use of HTML markup to reinforce the semantics, or meaning of information in webpages and apps rather than to merely define its presentation or look. CSS is used to suggest its presentation to human users.
Search Engine Optimization (SEO) is the process of getting traffic from the "free," "organic," "editorial" or "natural" search results on search engines.
508, Semantic Markup, and Search Optimization utilize HTML on the web to give users and developers the best experience. It forces developers to create pages that will be easy for the browser and other developers to understand while giving users a website that they can easily navigate and use. The combination of these elements allows for users on the web to find the information they desire from the best sources when search engines prioritize result who meet these standards. This combination of tools allows for easier and quicker access on the web today than before the standards were implemented.