A URL filtering profile is a collection of URL filtering controls that are applied to individual security policy rules to enforce your web access policy. The firewall comes with a default profile that is configured to block threat-prone categories, such as malware, phishing, and adult. You can use the default profile in a security policy, clone it to be used as a starting point for new URL filtering profiles, or add a new URL filtering profile that will have all categories set to allow for visibility into the traffic on your network. You can then customize the newly added URL profiles and add lists of specific websites that should always be blocked or allowed for more granular control over URL categories. For example, you may want to block social-networking sites, but allow some websites that are part of the social-networking category.