Firewall is the strongest line of defense in the system, also a barrier between the intranet and the extranet (Internet), and protects our computer by controlling the flow of packets in and out and preventing access by illegal users according to rules predefined by the system administrator. The built-in Windows Firewall is not only not powerful enough, but also difficult for the average computer users to configure and maintain (so few people use it). That's why there are many third-party firewall programs like simplewall.

Firewall is a defense system between the local network and the external network/Internet, also an effective access control mechanism when these two networks communicate with each other. However, as everyone knows, Microsoft's built-in firewall in Windows performs practically no function and is rarely used all the time, simply because it is difficult to use. As a result, some third-party firewall control tools such as Windows 10 Firewall Control came out.