Final answer:
The statement is True.A rootkit is indeed malicious software that secretly infiltrates a computer system, altering its operations without user knowledge, typically to gain unauthorized access and control.
Step-by-step explanation:
True. A rootkit is a type of malicious software (malware) that is designed to gain unauthorized access to a computer system without being detected. Once installed, a rootkit can enable attackers to modify system functions, execute files, change user permissions, monitor activity, and access sensitive information, all without the user's knowledge. Rootkits are known for their stealth and can be challenging to detect and remove, often requiring specialized tools and expertise.