Content Security Policy (CSP) is a security feature that helps protect websites from various types of attacks, such as Cross-Site Scripting (XSS) and data injection. It allows web developers to specify which sources of content are trusted, thereby reducing the risk of malicious content being executed in a user's browser. By implementing a CSP, website owners can control where resources like scripts, images, and styles can be loaded from. This means they can block unauthorized sources, enhancing the overall security of their site and safeguarding user data from potential threats.