Asoftware-based is dedicated to examining and blocking internet traffic.

A software-based firewall is dedicated to examining and blocking internet traffic.

Explanation:

If we are seeking the answer we find that in computer world, a firewall is a network security system which is available for monitoring and controlling of entire incoming and outgoing network traffic, depended on predefined security rules.  

In addition a firewall typically forms a barrier or wall between a trusted or known internal network and untrusted or unknown external network like the Internet.

We also get that a firewall is often divided into two category which are network firewall and host-based firewall.

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