Final answer:
Rootkits are used by hackers to gain unauthorized access to a computer system, carry out various activities, and maintain control without being detected.
Step-by-step explanation:
Rootkits are typically used by hackers to gain unauthorized access to a computer system and maintain control over it without being detected. They are a type of malicious software that hides its presence and allows attackers to carry out various activities such as stealing sensitive information, modifying system configurations, and launching further attacks.
Hackers may use rootkits to achieve different goals depending on their intentions. For example, they might use rootkits to extract financial information like credit card details or login credentials to gain unauthorized access to accounts. They can also use rootkits to install additional malware or create a backdoor access to the compromised system for future exploitation.
Preventing rootkit attacks involves using up-to-date antivirus and security software, regularly updating operating systems and applications, and practicing safe online behavior like not opening suspicious email attachments or clicking on unfamiliar links.