The Same-Origin Policy (SOP) is a crucial security mechanism implemented in all modern web browsers. It fundamentally dictates that a web browser permits scripts contained in a web page to access data in another web page only if both web pages share the same origin. An origin is precisely defined by the combination of `protocol, host, and port`; all three components must match for two resources to be considered same-origin. This policy prevents malicious scripts from one website from reading sensitive data or interacting with resources on another website without explicit permission, thereby safeguarding user information. For instance, without SOP, a script on a rogue website could potentially read private information from your banking site if both were open in your browser. While primarily restricting read access, it significantly enhances web security by mitigating risks such as Cross-Site Scripting (XSS) and Cross-Site Request Forgery (CSRF) attacks. Mechanisms like Cross-Origin Resource Sharing (CORS) provide controlled ways for websites to explicitly grant access and bypass SOP when legitimate cross-origin communication is required. More details: https://tour-tv.com/