A firewall is a system designed to prevent unauthorized access to or from a private network. Firewalls can be implemented in both hardware and software, or a combination of both.
Firewalls are frequently used to prevent unauthorized Internet users from accessing private networks connected to the Internet, especially intranets.
All messages entering or leaving the intranet pass through the firewall, which examines each message and blocks those that do not meet the specified security criteria.
Many anti-virus programs contain firewalls which you can turn on or off when you want to download authorized new programs
Your Internet provider has numerous firewalls and other security precautions to protect them and all of us when we are using their Internet services
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