A web application firewall (WAF) is a software or hardware solution built for monitoring and controlling network traffic on web-enabled applications. A relatively secure barrier is established between the system and external environments by using a WAF. It understands and provides web protection at the application layer of the open system interconnection model from many attacks types, such as DT, SQLI, XSS, and RFI. The absence of WAF results in loss of data or unavailability of data, which can result in the interruption of business processes. WAF detects and blocks attempts to exploit known web application vulnerabilities by shortening the window of exposure while patches are thoroughly tested and deployed. Therefore, a WAF is an essential requirement for the proper functioning of any critical business processes.
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