Cartoon illustration of a brick wall firewall throwing mail packets into a trash can.

Imagine a network firewall, which is a security device that monitors and controls incoming and outgoing network traffic, standing tall. In front of it, there are packets of data, represented as small envelopes or boxes. The firewall is depicted with a stern expression, and as it inspects each packet, it throws the unwanted or suspicious ones into a nearby trash bin. The trash bin is overflowing with packets that didn't pass the firewall's security checks. See more