The document discusses terrorism risk in the insurance sector. It defines terrorism and outlines the challenges in quantifying terrorism risk due to the unpredictable nature of terrorist attacks. Terrorism risk has three main components - threat, vulnerability, and consequence. Threat refers to the probability of an attack occurring, vulnerability is the probability of damage resulting from an attack, and consequence is the expected magnitude of damage. Terrorism risk is calculated as the product of these three components. Estimating each component is challenging due to uncertainties. The document also provides a brief history of terrorism and different types of terrorism.