A firewall is your primary defense against external threats. You may think that this is only a worry for large corporations, but you would be very wrong. It is estimated that each new internet user's system is scanned within just minutes of connecting to the web. Those scans are probing for easy targets, and an unsecured PC is ripe for exploitation. Acting as an intelligent barrier a properly configured quality Firewall can effectively end this threat. Without it your door is wide open, the only thing stopping you being attacked is chance - Do you really want to be a fish in a barrel?