What is JDK, JRE, JVM in Java?

It is very important, as a developer, that we know the architecture of the JVM, as it enables us to write code more efficiently.

JDK, JRE, and JVM are all components of the Java platform, but they serve different purposes:

1. JDK (Java Development Kit): The JDK is a software development kit that includes all the tools needed to develop, compile, and run Java applications. It includes the JRE (Java Runtime Environment), as well as a compiler, a debugger, and other tools. JDK provides tools like compiler, debuggers, etc for code development. JDK = (JRE) + Development tools

2. JRE (Java Runtime Environment): The JRE is the environment in which Java applications are executed. It includes the JVM (Java Virtual Machine) as well as a set of libraries and other files that are needed to run Java applications. JRE is mainly used for environment creation to execute the code. JRE provides libraries and classes required by JVM to run the program. JRE = (JVM) + Libraries to execute the application

3. JVM (Java Virtual Machine): The JVM is the virtual machine that runs Java bytecode. It is responsible for allocating memory, managing memory, and providing security. JVM also provides the execution environment for the Java bytecode, it converts the bytecode into machine code which is understandable by the computer. JVM provides specifications for all the implementations to JRE. JVM does not include any tools, but instead, it provides the specification for implementation. JVM = Runtime environment to execute Java byte code.

In summary, the JDK is a complete package that includes everything you need to develop, compile, and run Java applications, while the JRE is the environment in which Java applications are executed, and the JVM is the virtual machine that runs the Java bytecode.