Which malware type collects information from a user's computer and sends it to a third party?

The correct answer is Spyware. This type of malware is specifically designed to gather personal information from a user’s computer without their consent. It can monitor user activity, capture keystrokes, and collect sensitive data, such as login credentials or financial information. Once the information is gathered, Spyware typically transmits it to a remote server controlled by the attacker, often for malicious purposes such as identity theft or fraud.

Trojan Horses, while they can also compromise a system, primarily masquerade as legitimate software to trick users into installing them, rather than specifically targeting information collection. Worms are self-replicating malware that spread across networks, but they do not have the primary purpose of monitoring or gathering user data. Adware, on the other hand, usually displays unwanted advertisements and may track user behavior to deliver targeted ads, but it does not focus as directly on secretly gathering sensitive information to send to third parties as Spyware does.