What is firewall ?

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A firewall is a network security system that monitors and controls over all your incoming and outgoing network traffic based on advanced and a defined set of security rules.
  Broadly speaking, a computer firewall is a software program that prevents unauthorized access to or from a private network. Firewalls are tools that can be used to enhance the security of computers connected to a network, such as LAN or the Internet. They are an integral part of a comprehensive security framework for your network.

A firewall absolutely isolates your computer from the Internet using a "wall of code" that inspects each individual "packet" of data as it arrives at either side of the firewall — inbound to or outbound from your computer — to determine whether it should be allowed to pass or be blocked.

courtesy: https://personalfirewall.comodo.com/what-is-firewall.html

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