How are rootkits different from other forms of malware?

Rootkits are a specific type of malware designed to gain unauthorized access to a computer system while remaining hidden from detection. Unlike other forms of malware, which may be overt in their actions (like viruses or ransomware), rootkits focus on stealth and persistence, often modifying the operating system or software to conceal their presence. This makes them particularly challenging to detect and remove, as they can operate at a low level, intercepting calls between the operating system and applications. Their primary goal is to maintain control over a system without alerting the user or security tools.