URL categories classify websites based on content type or risk, enabling dynamic policy enforcement such as blocking or allowing access. Administrators can create custom URL categories to group sites like gambling domains and apply blocking rules across the firewall infrastructure. Palo Alto Networks firewalls leverage URL categorization combined with threat intelligence to provide granular web filtering, reducing exposure to malicious or unwanted sites. This dynamic grouping approach is more manageable and scalable than creating individual signatures or static lists and allows for automated policy application aligned with organizational compliance requirements.