Java Bean is a reusable software component written in the Java programming language that follows the JavaBeans component model. It is a class that encapsulates properties, methods, and events in a single package, making it easy to use in various applications. Java Beans have a set of standardized rules and conventions that define their behavior and enable them to be easily integrated into different environments, such as Java applets, servlets, and Enterprise JavaBeans (EJBs). They are commonly used in graphical user interface (GUI) development and are designed to be visually manipulated and connected together.