**Java programming** is used for building both simple applets and enterprise software. 

Java core contains different software bundles to meet the specific needs for building the different types of application software.

#key# JRE: Java Runtime Environment #key# and #key# JVM: Java Virtual Machine #key# are the two significant software bundles used to form Java applications. 

Both JVM and JRE are platform-dependent as there are multiple operating systems like Windows, Linux, and more.

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## Purpose of JRE and JVM

The JVM and JRE become active after programming code has been created. *End-users* only use JVM and JRE to execute the application program.

**JRE** identifies all the helpful class libraries needed for execution, while **JVM** is a subclass of JRE that decodes the bytecode into machine language and other minor tasks.

JVM and JRE do not participate in development processes like *debugging* and *compiling*; #key# JDK: Java Development Kit #key# is used for them. 

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## Difference between JRE and JVM

A list of major differences between JRE and JVM is in the table below:

---
|**JRE**|**JVM**|
| - | - | 
|JRE contains Java class libraries, Java virtual machines, and other tools that the programs need to execute. Please note the development tools like compiler and debuggers are not included in JRE. | JVM does not have many additional tools. It is mainly biassed to code conversion and performs other minor functions, i.e., memory management and security. It converts bytecode into low-level machine code, i.e., Assembly language.|
| JRE creates a runtime environment in which the program can run effectively.| JRE creates a runtime environment in which the program can run effectively.|
| JRE becomes operational at the moment when the application program is executed. | JVM becomes operational when the bytecode needs to be interpreted into machine language. |
| JRE works on the whole program. This means it identifies specific libraries and packages it needs to perform, such as math,  util, swing, lang, and AWT.| JVM is a segment of JRE so it cannot be installed or downloaded directly.  We interrupt with JVM after JRE installation. |
|JRE is installed into JDK by default.|JVM is sub-bundled with JRE, whose main function is to read the generated bytecode.|

*JVM and JRE do not take part in development processes like debugging and compiling, JDK is used there.* 


What is the difference between JVM and JRE?

JRE runs programs by providing necessary class libraries. JVM converts bytecode into machine language and handles minor tasks. JDK is used for development, not JRE/JVM.

JRE	JVM
JRE contains Java class libraries, Java virtual machines, and other tools that the programs need to execute. Please note the development tools like compiler and debuggers are not included in JRE.	JVM does not have many additional tools. It is mainly biassed to code conversion and performs other minor functions, i.e., memory management and security. It converts bytecode into low-level machine code, i.e., Assembly language.
JRE creates a runtime environment in which the program can run effectively.	JRE creates a runtime environment in which the program can run effectively.
JRE becomes operational at the moment when the application program is executed.	JVM becomes operational when the bytecode needs to be interpreted into machine language.
JRE works on the whole program. This means it identifies specific libraries and packages it needs to perform, such as math, util, swing, lang, and AWT.	JVM is a segment of JRE so it cannot be installed or downloaded directly. We interrupt with JVM after JRE installation.
JRE is installed into JDK by default.	JVM is sub-bundled with JRE, whose main function is to read the generated bytecode.