Machine Independent Vs Platfrom Independent

Platform Independent — (Portability)
As JAVA is the one of the most popularly known Platform Independent Language known across worldwide.
Platform Independent means that- You write your code once and you can run it multiple times, on any machine (either same or different) i.e. WORA (Write Once,Run Anywhere).
In Platform Independent Languages you get the ByteCode (.class file) instead of executable code(.exe file).
In case of JAVA, the source code (the code written by user in High Level Language) goes to the compiler (Java Development Kit) (compiler - which converts the High Level Language Code into the Machine Level Language Code, that the machine can read the code easily) and gets converted into the ByteCode.
The ByteCode is the only code that you need to run on any machine.
Once you get the ByteCode you can run it on any other Machine.
The ByteCode is not the Executable Code, to execute it the machine should must have the JVM(Java Virtual Machine, it is inside the JDK) installed on it.
The JVM interprets the ByteCode and executes it.

Note — The JAVA is the Platform Independent, but the JVM is Platform Dependent, because the JVM is different for different achitecture and different OS (JVM is different, is can be verified when you goes to download it from the website, it will give you the option that for which achitecture or OS you want to download it).

Machine Independent — (Cross Platform)
As C++ is one of the most popular Machine Independent Language known across worldwide.
Machine Independent means that you can write your code once and you can run your code on any other machine multiple times , but the main point is that your another machine should also have the same architecture and OS as on which you have compiled the source code.
In Machine Independent Languages you get the executable code(.exe file) instead of ByteCode(.class file).

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