Firewall in IT Glossary

a combination of hardware and software that provides a security system,
unsually to prevent unauthorized access from outside to an internal
nextwork or intranet.a firewall prevents direct communication between
nextwork and external computer by routing communication though
a proxy server outside of the nextwork.The proxy server determines
whether it is save to let a file pass though to the nextwork.The proxy server
determines wether it is save to let a file pass though to the nextwork.
A firewall is also called mines whether it is safe to let a file
pass though to the nextwork.A firewall also called a security - edge gateway.