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Avira Firewall is not a standalone application, it's a built-in in Avira Premium Security Suite. It’s a robust firewall that lets the user allow or deny Internet access to your applications, allow or deny data traffic, allow or deny incoming and/or outgoing IP, TCP or UDP packets, allow or deny passive listening to the application of ports, allow or deny code injection*, allows creation of rules for your network, prevent modification of the HOSTS file, among other possibilities. Summarizing: It's a complete firewall.

Avira Firewall doesn’t have a built-in HIPS, but Avira 10 introduced a new behavior-based detection technology called Avira AntiVir ProActiv in the Avira's Guard. AntiVir ProActiv constantly monitors the behavior of the system in real-time and looks for unusual events. An integrated rule-system is able to decide proactively if a certain event (or a combination of events) indicates that the system is currently under attack from a new or unknown malware. If a rule matches the user is then able to decide what to do with this suspicious file, i.e. to trust it, to block it once, to block it always or to ignore it. More information here:

* Code injection is a technique for introducing code into the address space of another process to execute actions, forcing this process to load a dynamic link library (DLL). Code injection is used by malware, amongst other things, to execute code under cover of another program. In this way, access to the Internet in front of the Firewall can be hidden. In default mode, code injection is enabled for all signed applications. - from Avira Help Guide.