IT Security refers to techniques that ensure the data in one computer cannot be read or shared with anyone outside of that computer without authorization. The security of computer networks continues to increase in importance as more business is conducted over the Internet. Organizations need to understand how their systems are vulnerable and how to protect their infrastructure and Internet sites from hackers, viruses, and other acts of cyber-terrorism. The emergence of "cyber-security" is a key issue facing most organizations and IT professionals in ethical hacking and security has in turn grown.