![]() All communications are instead routed through another system known as a proxy server. Typically, a firewall allows no direct connection between the network and the Internet. A firewall also logs information about network traffic, which can help an administrator understand and prevent attacks. It decides which action to take on the basis of a set of polices determined by the network administrator or personal user. They have become a standard part of corporate, governmental, and personal networks.Īt its most basic, a firewall either permits or blocks a requested network connection, such as a Web site, an e-mail, or a file transfer. Firewalls can also help combat the spread of computer viruses and other malware, or malicious software. They thus work to prevent sabotage of the system and the theft or unauthorized viewing of private or sensitive data, such as through the use of spyware. Firewalls are mainly intended to protect an individual computer system or network from being accessed by an intruder, especially via the Internet. A type of computer-security system, a firewall controls the flow of data from one computer or network to another.
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