A Web Application Firewall (WAF) is a security device designed to protect organizations at the application level by filtering, monitoring and analyzing hypertext transfer protocol (HTTP) and hypertext transfer protocol secure (HTTPS) traffic between the web application and the. A Web Application Firewall (WAF) is a security device designed to protect organizations at the application level by filtering, monitoring and analyzing hypertext transfer protocol (HTTP) and hypertext transfer protocol secure (HTTPS) traffic between the web application and the. A WAF creates a shield between a web app and the Internet; this shield can help mitigate many common attacks. What is a WAF? Web application firewalls (WAFs) are a critical security defense for websites, mobile applications, and APIs. WAFs can be host-based, network-based or cloud-based and are typically deployed through reverse proxies and placed in front of an. This article provides a detailed look at what a WAF is, how it protects web applications, the deployment options available, and how to select, configure, and manage a WAF for your organization. Special attention is given to SonicWall's offerings and how its WAF solutions address the needs of modern.