What kinds of language Kotlin is?

Question

Kotlin is using for developing Android.

Answer 1

Kotlin is a statically-typed programming language that runs on the Java virtual machine and also can be compiled to JavaScript source code or use the LLVMcompiler infrastructure. Its primary development is from a team of JetBrainsprogrammers based in Saint Petersburg, Russia.[2] While the syntax is not compatible with Java, Kotlin is designed to interoperate with Java code and is reliant on Java code from the existing Java Class Library, such as the collections framework. Kotlin uses aggressive Type Inference to determine the type of values and expressions for which type has been left unstated. This reduces language verbosity relative to Java, which demands often entirely redundant type specifications.
One of the obvious applications of Kotlin is Android development. The platform was stuck on Java 7 for a while (with some contemporary language features made accessible through the use of Retrolambda[23]or the Jack toolchain[24]) and Kotlin introduces many improvements for programmers such as null-pointer safety, extension functions and infix notation. Accompanied by full Java compatibility and good IDE support (Android Studio[25]) it is intended to improve code readability, give an easier way to extend Android SDK classes and speed up development.[26]

Kotlin was announced as an official Android development language at Google I/O 2017. It became the third language fully supported for Android, in addition to Java and C++.[27]

That's what Wikipedia says.