Rootkit definition in Cybersecurity

A rootkit is a collection of malicious software tools that enable unauthorized access to a computer or a part of its software and often mask its existence or the existence of other software.

Notable Incidents

1. Sony BMG copy protection rootkit scandal, which secretly installed rootkit software on users' computers. Wikipedia
2. Stuxnet, which used a rootkit to hide its presence on infected systems.

How to Protect Your Network against Rootkit

1. Use reputable antivirus and anti-rootkit software.
2. Keep all systems and software up to date.