
When to use kotlin? Kotlin can be used for any kind of development, be it client-side (With JavaScript), server-side (JVM), Android, embedded systems (With Kotlin/Native), mobile applications. It has been developed under the Apache 2.0 license and perfected for more than 5 years by the company JetBrains.

It is designed to interoperate fully with Java, but it also targets Android, JavaScript and Native. This language is intended to be concise (Rough estimates indicate approximately a 40% cut in the number of lines of code) and 100% interoperable with the Java programming language. Kotlin is a general-purpose programming language with type inference.
