Introduction To Groovy Programming Language Introduction to groovy Groovy is an object-oriented programming language which could be described as Java paired with a dynamic scripting language like JavaScript or Python. You can use Groovy in two different "modes": You can compile Groovy to JVM Bytecode like Java. That way you just need to package it with the groovy library and it can run in the JVM like Java can. You can use your build system (e.g. the Groovy Gradle plugin ) to use and build Groovy in your regular projects. Y ou can use it as a scripting language . Just write your Groovy code inside a file and execute this file by calling (once you have Groovy installed): $ groovy your- script.groovy It is a superset of Java . This means any valid Java code is a valid Groovy code also. If you don't like using Groovy, you can use plain Java syntax when working with Grails. It is a dynamic language similar to Python, Ruby and Perl .