Cisco Umbrella groups harmful destinations into categories of security threat, such as Malware, Command Control Callbacks, Phishing Attacks, Dynamic DNS, Potentially Harmful Domains, DNS Tunneling VPN, and Cryptomining1. When web policies are configured in Cisco Umbrella, the security category blocking provides the ability to ensure that domains are blocked when they host malware, command and control, phishing, and more threats. By enabling or disabling these categories, the administrator can control the identity access to these destinations and protect the network from malicious traffic2. References: 1: Security Categories - Umbrella User Guide 2: Manage Security Settings - Umbrella User Guide