All Ask Computer and Internet Glossary
A firewall is software or hardware that acts as a barrier between a computer system, or network and the Internet. A firewall will intercept attempts to connect to your computer system and will block hacking, viruses, trojans and any unauthorised access. A firewall prevents direct communication between network and external computers by routing communication through a proxy server outside of the network. The proxy server determines whether it is safe to let a file pass through to the network. A firewall may also be called a security-edge gateway. Firewalls prevent unauthorised access TO and FROM a system or private network.
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