Final answer:
A cluster of computers controlled by hackers for malicious activities like disrupting communications and stealing data is known as a botnet.
Step-by-step explanation:
A large group of computers controlled from one or more remote locations by hackers without the knowledge or consent of their owners is called a botnet. Hackers use botnets for various malicious activities, including breaking into websites, phishing attempts to get individuals to click on malicious links, and manipulating users into divulging sensitive information.
Governments and militant groups have utilized these cyber weapons to conduct cyber espionage, cause disruptions in communications, and spread disinformation. The hacking community, as depicted in popular culture such as the movie 'The Net' with Sandra Bullock, reflects society's concerns over digital security threats.