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Firewall is a computer security measure that helps protect your computer by preventing unauthorized access to your computer, network, or data. A firewall blocks all kinds of traffic, including but not limited to, incoming and outgoing requests for resources on the computer.

Firewalls are used in networks to protect computers and other devices from unauthorized access by other users or by malicious software. A firewall can be either stand-alone or part of a security suite.

In a stand-alone firewall, the firewall is installed on a computer, and all incoming and outgoing traffic is screened. In a network firewall, the firewall is installed on one or more computers and monitors traffic between these computers and the Internet.

A security suite includes a firewall, antivirus software, and other security tools. When you install a security suite, the suite installs the firewall on your computer and sets it up to monitor traffic between your computer and the Internet.