Which type of malware is designed to replicate itself and spread to other devices without user awareness?

The type of malware that is specifically designed to replicate itself and spread to other devices without user awareness is a worm. Worms can take advantage of network vulnerabilities to propagate across connected systems, often using the internet or local network environments. Unlike other types of malware, worms do not need to attach themselves to a host program or rely on human interaction to spread; they can autonomously replicate and distribute themselves, making them particularly dangerous and widespread.

In contrast, spyware is designed to monitor user activity and gather information, typically focusing on surveillance rather than replication. A Trojan horse masquerades as legitimate software but does not replicate itself; instead, it tricks users into executing it. Adware primarily serves the purpose of delivering unwanted advertisements and may track user behavior, but it is not focused on self-replication like worms are. Understanding the unique characteristics of each type of malware helps in recognizing potential threats and enhancing cybersecurity awareness.