Traditional firewalls focus on blocking simple threats and intrusions.

Business grade Firewalls have added Unified Threat Management (UTM) services such as anti-virus, anti-spyware, intrusion prevention, content filtering and even some anti-spam services to enhance to threat protection.

Most traffic passing through a Firewall is not threat-based, but is instead applications and data. This gave rise to the Application Firewall which can manage and control data and applications that pass through the Firewall.