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A firewall is a security system (typically software-based) that manages the connection between computers, networks and the Internet. Its purpose is to prevent unauthorised access and use of your computer by unauthorised individuals (or programs).

Firewall software can be programmed to prevent the download of specific file types as a virus-protection measure. This can be an issue with sites that use rich media formats (such as Flash).

Related terms: referrer blocking, virus


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