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Spyware Glossary
Adware | Anti-spyware software | Browser Hijacker | Cookie (or Adware Cookie) | Dialer | Drive-by-download | Encryption | Firewall | Information Privacy | Keylogger | Layered Socket Provider (LSP) | Operating System | Personally Identifiable Information (PII) | Privacy | Privacy Policy | Remove me | Shareware | Spam |Spyware |System Monitor |Trojan Horse |Virus | Worm |
Firewall
A firewall prevents computers on a network from communicating directly with external computer systems. A firewall typically consists of a computer that acts as a barrier through which all information passing between the networks and the external systems must travel. The firewall software analyzes information passing between the two and rejects it if it does not conform to pre-configured rules. Firewalls provide effective protection against worm infection, but not against spyware like Trojans, which hide in legitimate applications, then install secretly on a user's PC when the application is launched.
