A good firewall that allows you to set access rights for each program on your computer. When one of these programs to find ways to establish a connection with the outside world, the firewall will block this connection attempt of the program and put out warning for you unless it identifies the program have confirmed that you have allocated for program rights make these connections of this type. This helps prevent malicious software [6] are seeking to spread viruses or connect with hackers invade your computer. As such, the firewall acts as a second protection shields at the same time as the early warning system helps you recognize when your computer's security system had problems.
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