Cybercrime refers to criminal activity that targets or uses computers, networks or devices. It can be carried out by individuals or organized criminal groups. Common cybercrimes include hacking, phishing, identity theft, and spreading malware. Cybercriminals use techniques like botnets, zombie computers and denial of service attacks. The majority of cyber attacks come from system insiders, viruses and theft of proprietary information. It is important for individuals and organizations to protect themselves by keeping software updated, using strong passwords, cybersecurity awareness and purchasing cyber insurance.