A firewall is a software that adds an extra layer of security to your computer. It is typically used with antimalware to prevent unauthorized users from gaining access to your systems. It lets you transmit information freely, but checks any incoming data using security rules you have set up. Inbound traffic that do not conform to these rules are rejected. This reduces the amount of unwanted traffic and frees up more resources for legitimate data communication to take place.

You can compare a firewall to an electric fence that provides extra protection for you against thieves and other suspicious characters.

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