What is bytecode ?

Answer 1

Byte code is the language for the JVM . The java compiler makes bytecode from the source code, then the JVM makes mschine code.
Thats why Java is platform independent because the source code compile to bytecode.

Answer 2

Thanks bro

Answer 3

Python also has it. The most simple explication of this should be the following diagram

Source code > Byte code > Mashine code
User language > Trabslating process > Mashine instructions

This should be true for any scripted or high-level language.