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Web Application Security refers to the practice of protecting web applications from threats and vulnerabilities that could result in unauthorized access, data breaches, or system damage. It involves implementing security measures at every stage of the application's lifecycle, from design and development to deployment and maintenance. Web Application Firewall, as a parent category, plays a crucial role in this area by providing a protective shield against common web attacks such as SQL injection, cross-site scripting (XSS), and local/remote file inclusion. By analyzing incoming HTTP traffic and filtering out malicious requests, a Web Application Firewall helps ensure the confidentiality, integrity, and availability of web applications. Therefore, Web Application Security, as a subcategory under Web Application Firewall, focuses on identifying and mitigating potential risks to web applications, ensuring that they are robust, secure, and resilient against cyber threats.