[生活] What is a firewall? what's the effect?

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I believe everyone has heard of the industrial firewall . The firewall is an important fire partition with a high fire resistance rating in a building and a powerful facility to prevent the spread of fire. But now it is more used to describe the network firewall. What is the firewall?

A firewall is a piece of software that sits between a computer and the network to which it is connected. All network traffic to and from this computer passes through this firewall. A firewall scans the network traffic that flows through it, which can filter out some attacks before they can be executed on the target computer.

Firewalls can also close unused ports. And it can also prohibit outgoing communication from specific ports and block virus Trojans. Finally, it can block access from special sites, preventing all communications from unknown intruders.



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