A Java Bean is essentially a standard Java class which adheres to certain conventions. These conventions include: 1. It should have a no-arg constructor - a constructor with no arguments. This allows easy instantiation. 2. The class properties (or instance variables) must be private to ensure data encapsulation, and accessed via getter and setter methods that follow a naming convention. For instance, if the instance variable is "name", its getter method would be "getName" and setter would be "setName". 3. The class should be Serializable. This means the class should implement the java.io.Serializable interface, allowing the state of an object to be saved or transported. Java Beans are commonly used in Java-based software components (JSP, Servlets, EJB etc.) because they can be easily reused and their properties, events, and methods can be manipulated in a standard way. Here's a very simple example of a Java Bean: ```java public class Employee implements Serializable { private String name; private int age; // No-arg constructor public Employee() { } // Getter and setter for 'name' public String getName() { return this.name; } public void setName(String name) { this.name = name; } // Getter and setter for 'age' public int getAge() { return this.age; } public void setAge(int age) { this.age = age; } } ``` This class `Employee` is a Java Bean. It has a no arg-constructor, private instance variables `name` and `age` with the respective getter and setter methods, and it implements `Serializable`. Now, this bean can be reused and manipulated in various parts of your application.