Firewall Vs No Firewall

What's a Firewall?

A firewall is software or hardware that helps prevent hackers and some types of malware from getting to your PC through a network or the Internet. It does this by checking the info that’s coming from the Internet or a network and then either blocking it or allowing it to pass through to your PC.

A firewall isn't the same thing as an antivirus or antimalware app. Firewalls help protect against worms and hackers, antivirus apps help protect against viruses, and antimalware apps help protect against malware. You need all three. 

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A firewall creates a barrier between the Internet and your PC

Allow an app to receive info through the firewall

By default, most apps are blocked by Windows Firewall to help make your PC more secure. To work properly, some apps might require you to allow them to receive info through the firewall.

Before allowing an app to receive info through the firewall, make sure you understand the risks involved. 

1. Open Windows Firewall by swiping in from the right edge of the screen, tapping Search (or if you're using a mouse, pointing to the upper-right corner of the screen, moving the mouse pointer down, and then clicking Search), entering firewall in the search box, and then tapping or clicking Windows Firewall.
2. Tap or click Allow an app or feature through Windows Firewall .
3. Tap or click Change settings.  You might be asked for an admin password or to confirm your choice.
4. Select the check box next to the app you want to allow, select the network types you want to allow communication on, and then click OK.