Answer:
Firewall
Explanation:
Generally in English, firewall can be described as a wall or barrier that is meant to prevent fire from spreading.
In computing, firewall refers to a network security system or a piece of computer software that is meant or used to prevent unwanted data to gain access to the system.
The primary function of firewall is to monitor and regulate entry and exist of network traffic based on the security rules that have all already been determined or put in place. It does this by putting in place a barrier among the external network that are trusted or the ones that are not trusted like the internet.
Therefore, firewall is software that acts as a filter to prevent unwanted packets from entering a network.
