A CSRF Token (Cross-Site Request Forgery Token) is a security measure used to protect web applications from unauthorized actions. It is a unique, secret value generated by the server and sent to the client, typically embedded in forms. When the client submits a form, the token is sent back to the server, allowing the server to verify that the request is legitimate and originated from the authenticated user. By requiring a CSRF Token, web applications can prevent malicious sites from tricking users into performing unwanted actions, such as changing account settings or making purchases. This helps ensure that user actions are intentional and secure, safeguarding sensitive information and maintaining user trust.