Thread: What is Firewall

What is Firewall? I saw in one website Firewall is software and hardware and mixture of software and hardware. It is used to protect user info for avoiding virus. How it is? Whether it is hardware? If not then why the images are like that? Any recommendations and suggestions are appreciated.

A firewall is a set of related programs, situated at a network gateway server that guards the resources of a private network from users from other networks. An endeavor with an intranet that permits its workers access to the wider Internet installs a firewall to stop outsiders from accessing its own private data resources and for controlling what outside resources its own users have access to.