jre in java

1• Java Runtime Environment :
2	It physically exists. 
3	The Java Runtime Environment provides
4    the minimum requirements such as libraries
5    and Class Loader for executing a 
6    Java application on JVM. 
7	It consists of the Java Virtual Machine
8    core classes, and supporting files.

1Java Virtual Machine: JVM is an abstract machine. 
2It actually runs by Java code. Most people know Java with this slogan 
3"Write once and run everywhere' This slogan is because of JVM. 
4• Java Runtime Environment : JRE is what we need to run a Java program 
5and containsset of libraries and other files that JVM uses at run time. 
6JRE = JVM + Library Classes 
7• Java Development Kit : JDK is what we need to compile Java source code 
8and contains JRE, development tools. JDK = JRE + Development tools

1• Java Runtime Environment : JRE is what we need to run a Java program 
2and containsset of libraries and other files that JVM uses at run time. 
3JRE = JVM + Library Classes