This document discusses inheritance in Java. It defines inheritance as a mechanism where a subclass inherits the properties and behaviors of its parent class. It provides an example of single inheritance in Java where class B extends class A, inheriting its attributes and methods. The document also describes different types of inheritance like multilevel inheritance where a class inherits from another subclass, and hierarchical inheritance where a parent class has multiple subclasses. It provides an example of inheritance between different animal classes to demonstrate these concepts.