Controls that a company implements to protect its assets and meeting the standards that a third-party has set forth as best practices.
Cross-origin resource sharing (CORS) is a browser mechanism which enables controlled access to resources located outside of a given domain. It extends and adds flexibility to the same-origin policy (SOP)
The Cross-Origin Resource Sharing standard works by adding new HTTP headers that let servers describe which origins are permitted to read that information from a web browser. Additionally, for HTTP request methods that can cause side-effects on server data (in particular, HTTP methods other than GET, or POST with certain MIME types), the specification mandates that browsers “preflight” the request, soliciting supported methods from the server with the HTTP OPTIONS request method, and then, upon “approval” from the server, sending the actual request. Servers can also inform clients whether “credentials” (such as Cookies and HTTP Authentication) should be sent with requests.