Wall's don't always have to be made of object's or in your mind. They all do the same thing, witch is to prevent something. They can be made in many ways, such as a physical wall, mental wall,
maybe even a visual wall but this one is completely different.
A Firewall (computing) is a system that is designed to stop unauthorized people from accessing a network. Firewall's are often used to stop unauthorized internet users from accessing private networks connected to the internet. All messages that enter and leave through the internet must pass through a firewall. Each message is "searched" and if it is blocked, then it does not meet the security specifications and is denied.
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