Final answer:
A Web Application Firewall (WAF) protects web applications by filtering and monitoring Internet traffic to prevent harmful requests and various types of attacks.
Step-by-step explanation:
A Web Application Firewall (WAF) is true in that it is designed to protect web applications by monitoring and filtering traffic between a web application and the Internet. It is a security layer that operates according to policies that determine what traffic is considered safe and what should be blocked, preventing harmful requests, such as SQL injection, cross-site scripting (XSS), and other common attacks, from reaching the web application. A WAF serves as a protective shield for websites and online services from various types of malicious activity.