Question

what do you mean by firewall​

Answer 1

Explanation:

a firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. A firewall typically establishes a barrier between a trusted network and an untrusted network, such as the Internet.

Hope it will help you

Answer 2

network security device

A firewall is a network security device that monitors incoming and outgoing network traffic and decides whether to allow or block specific traffic based on a defined set of security rules. ... A firewall can be hardware, software, or both.