What feature does FortiGate use to provide web filtering capabilities?

FortiGate uses FortiGuard Web Filtering as its primary feature to offer web filtering capabilities. This service provides real-time access to Fortinet's extensive database, which categorizes billions of web pages and domains into various content categories. This allows administrators to create granular policies based on user needs and organizational compliance requirements.

FortiGuard Web Filtering enables features such as blocking or allowing access to specific categories of content, enforcing safe search settings, and preventing access to potentially harmful sites, thereby enhancing network security. The service can also be regularly updated with the latest threat intelligence, ensuring that filtering remains effective against new and emerging threats.

The other options, while related to security, do not specifically provide web filtering capabilities in the same comprehensive manner as FortiGuard Web Filtering. For instance, a Web Application Firewall (WAF) is designed primarily to protect web applications from various attacks rather than to filter web traffic at the URL level. URL Inspection Service is focused on inspecting URLs but may not include the extensive database and support for categorization provided by FortiGuard. DNS Filtering provides a way to block unwanted domains at the DNS resolution stage but does not integrate the same depth of content control as FortiGuard’s web filtering service.