Firewalls protect the internal network from outside threats.
They can provide a level of security for your network. They can improve the performance of your network by blocking unwanted traffic. They can control what type of traffic is allowed into and out of your network. They can prevent unauthorized access to your network. Software-based firewalls are usually installed on individual computers and servers and provide a lower level of security. Hardware-based firewalls are typically installed between the network and the internet connection and provide a higher level of security. 
Firewalls can be hardware-based, software-based, or a combination of both. A firewall is a network security system that monitors and controls the incoming and outgoing network traffic based on predetermined security rules.
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