Web app security is a critical topic, particularly when it comes to user and session vulnerabilities such as cookie theft and cross-site request forgery (CSRF). CSRF attacks involve a malicious agent sending a forged request from one application to another while a user is signed in, potentially allowing unauthorized actions on the user's behalf. Traditional methods for mitigating CSRF, like checking HTTP headers, have been helpful, but the SameSite cookie directive offers an effective way to prevent such attacks by ensuring cookies are not sent with cross-site requests. Additionally, enhancing cookie security through techniques like using the __Secure and __Host prefixes can further protect user sessions by enforcing stricter requirements such as secure attributes and specific path settings. By combining these strategies with other security measures like the HTTPOnly and Secure attributes, developers can significantly bolster the security of their web applications against common threats.