Each level of inheritance inherits all properties and methods from its parent while adding its own unique features or modifications. The core idea is to build complex objects by layering features progressively, starting from a general base.

This approach is especially useful in domains with natural hierarchies such as fantasy games, where creatures, characters, and items often require multiple levels of specialization.

Deep inheritance allows you to build complex class structures by extending inheritance over multiple levels. Each level inherits from its parent and adds further specialization. It models is a relationships clearly (e.g., Knight is a Warrior is a Human), promotes code reuse by defining common features in base classes, and is useful for modeling complex domains such as game worlds.