Analyze the security implications of implementing Content Security Policy (CSP) in web applications.

CSP implementation significantly reduces XSS attack surface by controlling resource loading and script execution. It provides defense-in-depth against code injection, enables violation reporting for security monitoring, and helps identify potential attacks. However, implementation challenges include compatibility issues with legacy code, complex policy configuration, and potential functionality breaks. Success requires gradual deployment, thorough testing, and ongoing policy refinement based on application requirements and security needs.