Firewall protects us from unnecessary networks entering our system. It works as a blocker which is continuously at work while your system is running. It is very important, no one should turn it off. Some of the apps during installation tells us to turn off the firewall. If the app is from a trusted source do it. If it is not, then never do it. These are third party apps the developers of these apps want to enter your system and control it without your permission.
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