What is a byte code? Why does the groovy language preface the Java Virtual machine?

What is a byte code?

Bytecode can also be said to be a language, or an operational primitive that communicates with the operating system. The purpose of bytecode is actually to shield operating system differences, operating system differences to the professional virtual machine developers, they want to ensure that their development of virtual machines compatible with a variety of hardware platforms.

Why the groovy language requires a Java virtual machine

Java Virtual machine is not a Java virtual machine, this sentence is not nonsense. Because the Java virtual machine was originally intended for use in the Java language, but the virtual machine designers in the design, but also adopted the idea of design patterns, I provide a basic interface, no matter what language, in the future can be run to my virtual machine. So, the groovy language does not have to be a Java virtual machine, but the groovy language can take advantage of the natural platform of the Java Virtual machine, the groovy language designers can pay more attention to the upper design, rather than the underlying implementation.

What is a byte code? Why does the groovy language preface the Java Virtual machine?