Android is an open source and Linux-based Operating System for mobile devices such as smartphones and tablet computers. Android Studio is the official IDE for android application development. App development on Android was almost exclusively done using the Java programming language. Kotlin is a new open source programming language built by JetBrains, known for IntelliJ IDEA (Android Studio is based on IntelliJ IDEA). Kotlin is a language that runs on the JVM (Java Virtual Machine). Google has announced Kotlin as an official language on Android. Kotlin, is a statically typed programming language for the JVM, Android and the browser. It’s deep interoperability with Java, which attracts more Java developers. It is tools-friendly as IDE gives suggestions for Kotlin code, can convert Java code to Kotlin code. It is expressive to make your code more readable and understandable.