**What is a ‘Trojan’ in the context of network security?**

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1. A Trojan, or Trojan horse, is a type of malicious software (malware) that pretends to be a legitimate program or file.

2. It tricks users into installing or running it by disguising itself as something harmless or useful.

3. Once executed, it can perform harmful actions such as stealing sensitive data, creating backdoors for attackers, or installing other malware.

4. Unlike viruses or worms, Trojans do not self-replicate but rely on social engineering to spread.

**Answer:** Malicious software disguised as legitimate software to gain unauthorised access.

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