Firewall
A firewall acts as a security guard that helps protect your network.
It monitors attempts to gain access to your operating system and blocks unrecognized sources.
Think of it as a barrier between secured and controlled internal networks that can be trusted and external untrusted networks.
A firewall only allows connections that it has been set to be allowed based on pre-configured security rules.
A firewall can help protect your computer and data by managing your network traffic. It does this by blocking unsolicited and unwanted incoming network traffic.
A firewall could be both hardware and software. The hardware firewall usually sits between a switch and a router. Where a software firewall is a program on your computer that works through port numbers and applications.
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