Kotlin is a modern, statically typed programming language that runs on the Java Virtual Machine (JVM). It is officially supported for Android app development and is known for its concise and expressive syntax. Kotlin is fully interoperable with Java, allowing developers to integrate it into existing Java projects. It supports functional and object-oriented programming, making it versatile for a variety of applications. With its safety features, like null safety, Kotlin reduces common coding errors and improves productivity.