What is JVM?

JVM stands for Java Virtual Machine, a java runtime environment required to run java programs in any operating system. JVM includes java interpreter that handle the native function call to operating system. A different JVM is required for each unique operating system (Linux, OS/2, Windows 98, etc.), but any JVM can run the same version of a Java program. JVM will interpret the java program appropriate with the operating system where the java program runs, so programmer no need to worry about how the code is excecuted. Thats's how the java motto actually works, 'Write Once Run Anywhere'.