What is defined as criminal activities carried out using computers or the internet?

The term that defines criminal activities carried out using computers or the internet is "cybercrime." This encompasses a wide range of offenses including hacking, identity theft, online fraud, and the distribution of malicious software, among others. Cybercrime exploits the internet or electronic devices to commit illegal acts, which can result in financial loss, privacy violations, or disruption of services.

The other terms listed do have their distinct meanings: cybersecurity pertains to the protection of computer systems and networks from these malicious attacks, cyberbullying relates specifically to bullying that takes place online or through digital communications, and cyberlaw refers to the legal issues related to the internet, including governance and policies aimed at managing cyber-related activities. Each of these fields plays an important role in the broader context of technology and online behavior, but none specifically characterize the criminal acts themselves, which is why cybercrime is the correct choice.