Question

what is a threat actor (or malicious actor)?

Explanation:

A threat actor (malicious actor) is an individual/entity that conducts cyberattacks, security breaches, or malicious activities to exploit vulnerabilities, steal data, disrupt systems, or cause harm, e.g., hackers, cybercriminals, nation - state groups.

Answer:

A threat actor (or malicious actor) is an individual, group, or entity that engages in activities intended to compromise the security, integrity, or availability of computer systems, networks, or data, often for malicious purposes like stealing data, disrupting operations, or causing harm.