Cross-Site Attacks are security vulnerabilities that occur when a malicious website tricks a user's browser into executing unwanted actions on a different site where the user is authenticated. This can lead to unauthorized access to sensitive information or actions being performed without the user's consent. Common types of Cross-Site Attacks include Cross-Site Scripting (XSS) and Cross-Site Request Forgery (CSRF). These attacks exploit the trust that a user has in a particular website. For example, if a user is logged into their bank account and visits a malicious site, that site could potentially send requests to the bank, transferring money or changing account settings without the user's knowledge.