CORS, an acronym for Cross-Origin Resource Sharing, is a vital security mechanism implemented by web browsers. It specifically allows web applications running at one origin (a combination of protocol, domain, and port) to make controlled requests for resources from a different origin. This mechanism exists primarily to relax the Same-Origin Policy (SOP), which is a fundamental browser security restriction that prevents a web page from making requests to a different domain than the one that served the web page itself. While SOP is crucial for preventing malicious scripts from accessing sensitive data across domains, it is overly restrictive for legitimate cross-origin interactions, such as fetching data from public APIs, loading fonts, or integrating third-party services. CORS provides a secure and explicit way for servers to declare which origins are permitted to access their resources, thus enabling essential cross-origin communication without compromising security against unauthorized data access. More details: https://realdom.com.ua/