A Web Application Firewall (WAF) is a security solution that monitors and filters HTTP/HTTPS traffic between a web application and the internet. It protects web applications from common threats such as SQL injection, cross-site scripting (XSS), and other vulnerabilities by analyzing incoming requests and blocking malicious traffic.

Implementing a WAF is essential for safeguarding sensitive data, ensuring compliance with security standards, and maintaining the integrity and availability of web applications.