A firewall is a software that is used to support and preserve the security of a private network.
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These work by stopping unauthorised access to private networks and their main objective is to prevent unapproved web users or prohibited software from obtaining access to the private networks that are connected to the internet. Firewalls may be implemented in hardware, software or even a combination of both.
The firewall is usually the first line of defence in unlawful or prohibited activity to secure sensitive information. To better protect the data, it can also be encrypted.
Firewalls will generally utilise two or more of the following methods:
All IT professionals will be aware of and will use firewalls.