The term rootkit or root kit originally referred to a maliciously modified set of administrative tools for a Unix-like operating system that granted root access. If an intruder could replace the standard administrative tools on a system with a rootkit, the modified tools would allow the intruder to maintain root access over the system while concealing these activities from the legitimate system administrator

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What is a rootkit in Windows?
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The term rootkit or root kit originally referred to a maliciously modified set of administrative tools for a Unix-like operating system that granted root access. If an intruder could replace the standard administrative tools on a system with a rootkit, the modified tools would allow the intruder to maintain root access over the system while concealing these activities from the legitimate system administrator.

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What is a rootkit in Windows?