One nation implants a computer virus in another nation's power distribution system; the result is that the infected nation's capacity to provide heat and light to its citizens is destroyed. this is an example of

Cyber warfare. With increasing technology, traditional warfare may be used less often, since cyber warfare would be less costly in terms of human casualties and weaponry, while still having devastating effects. This could also be referred to as cyber terrorism, if the action is performed by a rogue nation.