Cybercrime is any illegal activity that uses computers, networks or the internet as a tool or a target, such as unauthorized access to systems, data theft, online fraud, ransomware extortion or identity theft. In the US it is prosecuted under laws such as the Computer Fraud and Abuse Act (CFAA) and state laws.
Related term in this glossary: Cyberattack
computer crime, online crime, cyber criminal activity, CFAA