A rootkit is a type of malicious software that stealthily infiltrates a computer or system, providing unauthorized access and control to cyber criminals. It operates at the deepest level of the operating system, concealing its presence and activities, making it challenging to detect. Rootkits can be used to steal sensitive data, modify system behavior, or create backdoors for future attacks. They are a severe cybersecurity threat, often requiring advanced tools and expertise to identify and remove. Protecting against rootkits involves strong security practices, regular system scans, and staying vigilant for any signs of suspicious activity on your computer or network.