What is JVM? Difference between JVM/JDK /JRE?

JVM (Java Virtual Machine):

• Abstract machine providing a runtime environment for Java bytecode.
• It is platform-dependent (implementations exist for Windows, Mac, Linux).
• Responsible for: Loading code, Verifying code, Executing code, Providing runtime environment.

JRE (Java Runtime Environment):

• Implementation of JVM.
• JRE = JVM + Set of libraries (rt.jar, etc.) + Other files.
• It provides minimum requirements for executing a Java application.

JDK (Java Development Kit):

• Full-featured Software Development Kit for Java.
• JDK = JRE + Development Tools (javac, jar, javadoc, debugger, etc.).
• Used by developers to create and compile Java programs.