What type of solution is a Web Application Firewall (WAF) primarily used for?

A Web Application Firewall (WAF) is specifically designed to protect web applications by filtering and monitoring HTTP traffic between a web application and the Internet. Its primary function is to prevent attacks such as SQL injection, cross-site scripting (XSS), and other vulnerabilities that are common in web applications. By analyzing the data being sent to and from the application, a WAF can identify malicious patterns and block them, ensuring the integrity, availability, and security of the web application. This protective measure is critical as web applications are frequent targets for cyber threats.

The other options, while important in their respective fields, do not relate to the primary function of a WAF. Creating virtual networks pertains to network management and architecture, managing load balancing focuses on distributing network or application traffic efficiently, and monitoring cloud costs involves financial oversight rather than security measures. Each of these plays a role in cloud and network functionality, but they do not encompass the protective capabilities that a WAF provides for web applications.