Firewall

Firewall (software) – is a computer program that protects a computer’s connection to the network, usually, the Internet from hacker attacks and malicious software. Among the firewall’s key tasks are: preventing unauthorized access to the computer, stealthing (hiding) all open ports, controlling which programs are allowed to access the Internet and automatically defending against hacker’s probes and mass-distributed attacks on the host PC. Advanced firewalls may have additional functionality.