Java is what defined laguage
Hello,
Java is a general-purpose computer-programming language that is concurrent, class-based, object-oriented, and specifically designed to have as few implementation dependencies as possible. It is intended to let application developers "write once, run anywhere" (WORA),meaning that compiled Java code can run on all platforms that support Java without the need for recompilation. Java applications are typically compiled to bytecode that can run on any Java virtual machine (JVM) regardless of computer architecture. As of 2016, Java is one of the most popular programming languages in use,particularly for client-server web applications, with a reported 9 million developers.

Hello Alok,
Java is a computer programming language. It enables programmers to write computer instructions using English-based commands. It’s known as a high-level language because it can be read and written easily by humans. Like English, Java has a set of rules that determine how the instructions are written. Once a program has been written, the high-level instructions are translated into numeric codes that computers can understand and execute.
If you are interested and want to learn Java programming lanaguage. You can prefer some online tutorials which can help you in learning as a beginner.
https://www.tutorialspoint.com/java/
https://www.codecademy.com/learn/learn-java
https://www.w3schools.in/java-tutorial/
All the best.