Java Development Kit (JDK) is Sun Microsystem's IDE for creating Java applications. It includes new versions of the Java Virtual Machine, Java class libraries, and development tools. It supports developing and deploying applications in international languages and has major enhancements to the abstract windowing toolkit (AWT). It adds a number of new features, including JDBC for database connectivity, RMI for remote object access, and foundation support for JavaBeans component development.JDK also includes the Java Archive Format (JAR), to bundle applets for easier download\; Java Native Method Interface (JNI), to allow Java to call up native libraries\; reflection, providing a secure means to access the objects at runtime\; serialization, to convert objects into a stream of bytes that can be saved, stored, and later used to create equivalent objects\; Java Interface Definition Language (IDL)\; and several other features.