A Trojan is best described as

A Trojan is best described as

• A. A self-replicating virus
• B. Malicious code hidden inside harmless program
• C. A firewall component
• D. A legitimate software update

Answer: (B)

Trojan malware hides malicious code inside a harmless-looking program, so it looks legitimate while secretly carrying out harmful actions once it’s run. The key idea is deception: the user is tricked into executing something that seems safe, and only then does the hidden payload activate. This contrasts with a self-replicating virus that spreads on its own, or with defensive tools like a firewall, or with a genuine software update. A Trojan relies on disguise and user action to install and execute its payload, which can lead to backdoors, data theft, or further malware.

Trojan malware hides malicious code inside a harmless-looking program, so it looks legitimate while secretly carrying out harmful actions once it’s run. The key idea is deception: the user is tricked into executing something that seems safe, and only then does the hidden payload activate. This contrasts with a self-replicating virus that spreads on its own, or with defensive tools like a firewall, or with a genuine software update. A Trojan relies on disguise and user action to install and execute its payload, which can lead to backdoors, data theft, or further malware.