What is the Difference between JDK and JRE ?

• The Java Runtime Environment (JRE) is
•  Basically the Java Virtual Machine (JVM) 
• Where your Java programs are being executed. 
• It also includes browser plugins for applet execution. 
• The Java Development Kit (JDK) is 
• The full featured Software Development Kit for Java, including the JRE, the compilers and tools (like JavaDoc, and Java Debugger), in order for a user to develop, compile and execute Java applications.