Protects web applications against sophisticated online attacks and application- layer DDoS attacks, triggers alerts and blocks malicious action in a timely manner. Their advantage is they function on application level; they dynamically learn and understand the web applications business logic and are able to detect anomalies in the mode of applications usage and data access. This component is a complementary upgrade to traditional protection systems such as firewalls and Internet Provider Security(IPS) systems. The PCI-DSS standrard also recommends use of WAF components for the protection of critical web applications. Depending on the system architecture and your needs, the WAF component can be implemented as a stand-alone platform or as a integrated software component on Application Delivery Controller(ADC) plaforms.