The aim of this course unit is to demonstrate principles and practical operation of different types of reinsurance aspects of property, causality, marine and aviation. Further reinsurance is truly international in its scope and is a highly specialized industry, yet many people have never heard of its existence. Reinsurance is the business of insuring an insurance company or underwriter against suffering too great a loss from their operations, and allowing an insurance company or underwriter to lay off a pass on part of their liability to another insurer on a given insurance which they have accepted.