Unified threat management (UTM) is a term coined by Charles Kolodgy of International Data Corporation (IDC) in 2004 which is used to describe network firewalls that have many features in one box, including e-mail filtering, anti virus, anti spam capability, an Intrusion detection or prevention system (IDS or IPS), and WWW content filtering, along with the traditional activities of a firewall. These are application-layer firewalls that use proxies to process and forward all incoming traffic, though they can still frequently work in a transparent mode that disguises this fact.