The Code Red worm was a computer worm first observed on July 13, 2001 that attacked computers running Microsoft's IIS web server. It caused over 359,000 computers to be infected by July 19th. A worm is a type of virus that spreads from computer to computer over networks like the internet and email to infect many systems quickly. Biometric security systems like fingerprint or eye scans offer improved authentication over passwords by requiring something unique to the individual rather than just a password. However, biometrics can be less reliable for some groups and more expensive than other options.