For example; hate crimes, telemarketing and Internet fraud, identity theft, and credit card account thefts are considered to be cyber crimes when the illegal activities are committed through the use of a computer and the Internet. Sourced from:http://www.webopedia.com/TERM/C/cyber_crime.html
What kind of a person is a cyber-criminal? A cybercriminal is faceless thanks to the internet. They can be anyone and can act from anywhere so long as they have a communications device that can access the internet.
A motive for committing the crime - monetary gain, strong emotions, political or religious beliefs, sexual impulses, or even just boredom or the desire for "a little fun."
Crime laws are different in every country too, which can make things really complicated when a criminal launches an attack in another country.
It could be months or even years before the victim notices the infection, as often these malicious items operate behind the scenes with the only visible effect being slower performance on the system that was infected.