What is the primary purpose of a Content Security Policy (CSP)?

The primary purpose of a Content Security Policy (CSP) is to add an extra layer of security to web applications. CSP is a security feature implemented in web browsers that helps mitigate the risk of cross-site scripting (XSS) and other code injection attacks. By specifying which sources of content are trusted and can be loaded by the web application, CSP helps prevent unauthorized scripts from executing and potentially compromising the security of user data.

A well-defined CSP can significantly reduce the attack surface for potential vulnerabilities by controlling not only the JavaScript that runs on the page but also other resources like images, stylesheets, and fonts. This makes it a critical component in securing web applications, thereby enhancing their overall robustness against various types of attacks.