Cybercrime involves any criminal activity that uses a computer, networked device, or network. Some cybercrimes are carried out for profit, others aim to damage or disable devices, and some spread malware or illegal materials. Common cybercrimes include hacking, identity theft, scams, computer viruses, and ransomware. Cybercrime can have public health and national security impacts, so combating it is a priority for law enforcement agencies like the FBI and DHS. Cybercriminals operate wherever there is opportunity, from individual cyberbullies to state-sponsored hackers in countries like China.