An insider threat refers to the risk posed by individuals within an organisation who may intentionally or unintentionally cause harm through the misuse of their access to the organisation's assets. These insiders can be current or former employees, contractors, or business partners with legitimate access to sensitive information, systems, and networks. Insider threats can manifest as data breaches, fraud, sabotage, intellectual property theft, or the leaking of confidential information. 

The motivations behind insider threats vary and can include financial gain, personal grievances, or coercion by external entities. Mitigating insider threats requires a multifaceted approach, including robust access controls, continuous monitoring of user activities, employee training, and the implementation of security policies that foster a culture of vigilance and accountability. By proactively identifying and addressing potential insider threats, organisations can protect their critical assets, maintain operational integrity, and ensure compliance with regulatory requirements, ultimately safeguarding their reputation and business continuity.