The term firewall has seen limited use since the late 1980s to describe a device to block unwanted network traffic while allowing other traffic to pass. The first published description of a "modern" firewall including use of that name was in 'Practical Unix Security' written in 1990 and published in 1991. The first description of a firewall, although not by that name, was also in 1990, in a paper by Bill Cheswick. A few of the industry pioneers …
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…company, is not justifying the expense or effort, but convincing management that it's safe to do so. A firewall provides not only real security - it often plays an important role as a security blanket for management. Lastly, a firewall can act as your corporate "ambassador" to the Internet. Many corporations use their firewall systems as a place to store public information about corporate products and services, files to download, bug fixes, and so forth.