What is java ?
            It is an object-oriented language similar to C++, but with advanced and simplified features. Java is free to access and can run on all platforms.
Java is: –
Ø Concurrent 
Ø Class-based 
Ø Independent 

What is Java used for?
             Java has been used in different domains. Some of them are listed below:
Banking: To deal with transaction management.
Retail: Billing applications that you see in a store/restaurant are completely written in Java.
Information Technology: Java is designed to solve implementation dependencies.
Android: Applications are either written in Java or use Java API.
Financial services: It is used in server-side applications.
Stock market: To write algorithms as to which company they should invest in.  
Big Data: Hadoop Map Reduce framework is written using Java.
Scientific and Research Community: To deal with huge amount of data.

Components in Java:

JVM (Java Virtual Machine)
                        It is an abstract machine. It is a specification that provides a run-time environment in which Java byte code can be executed.

Ø Specification
Ø Implementation
Ø Runtime Instance
JRE (Java Runtime Environment)
             JRE refers to a runtime environment in which Java byte code can be executed. It implements the JVM (Java Virtual Machine) and provides all the class libraries and other support files that JVM uses at runtime. 
JDK(Java Development Kit)
It is the tool necessary to:-
Ø Compile
Ø Document
Ø Package Java programs.

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