What Is Java?

When we go to any institute we listen java,we also know java but question is that "what is java" 

Here is simple answer about java is  "java is one programing language like c ans c++"


Question is that what is program?

then we can simply say program is a set of instruction 
Java is open source programing language 


Need of programing language


we know that computer know only byte code instruction  so that to interact with computer we need a language


Why we use java if we can do also programing in c or c++??
we know that java is enhanced virson of c and c++