Qun : What is Java. ? Ans : Java is a object based programming language ,its used for creating applications like as web application, windows application and for much more useful. and also other hand we can say "Java is the most widely used programming language which totally depende on platform." Qun : What is Platform in java / Why java Platform independent. Ans : A Platform is hardware and software environment where runs the java programs.so java need the platform environment. Qun : What is java program.? Ans : A java program consist of set of java instruction or keywords,some inbuilt classes, some other rules to makes a program. Qun : What is JRE in java.? Ans : JRE stands for Java Runtime Environment.its a java software and also with contains a JVM(Java Virtual Machine ).its we can say a platform. Qun : What is JVM in java.? Ans : First of all , JVM stands for Java Virtual Machine,It is a abstract machine which java source code convert into byte code, so jvm is