This is a fair question for those who are not familiar with this term. A firewall is a network security device that looks at incoming and outgoing network traffic and decides whether to allow or block traffic based on a defined set of security policy rules. It is as simple as that.
Cisco Umbrella provides the first line of defence against the threats on the internet, protecting against malware, phishing, and command and control callbacks wherever your users go. It protects your remote employees even when they are off the VPN. Umbrella provides complete visibility into internet activity across all locations, devices, and users, and blocks threats before they ever reach your network or endpoints.