What is cyber-terrorism?

Cyber-terrorism is the leveraging of a target's computers and information technology, particularly via the Internet, to cause physical, real-world harm or severe disruption of infrastructure.

Cyberterrorism can have a serious large-scale influence on significant numbers of people. It can weaken countries' economy greatly, thereby stripping the it of its resources and making it more vulnerable to military attack.

Cyberterror can also affect internet-based businesses. Like brick and mortar retailers and service providers, most websites that produce income (whether by advertising, monetary exchange for goods or paid services) could stand to lose money in the event of downtime created by cyber criminals.

As internet-businesses have increasing economic importance to countries, what is normally cybercrime becomes more political and therefore "terror" related.

Source: http://en.wikipedia.org/wiki/Cyber-terrorism