What type of malware is indicated when you cannot control your computer and a message demands payment to regain access?

Ransomware is a type of malware specifically designed to block access to a computer system or data, typically by encrypting files, until a ransom is paid. When you cannot control your computer and encounter a message demanding payment to regain access, it is indicative of ransomware at work. The primary function of this malware is to extort money from victims by creating a hostage situation with their own data or system.

In contrast, spyware is software that secretly monitors user activity and collects personal information without consent, while adware generates unwanted advertisements and may slow down systems but does not typically demand payment. Trojans are deceptive software that appears legitimate but can cause harm or provide unauthorized access to systems, but they do not usually operate in the same extortionate manner as ransomware.