Kotlin is an up-and-coming programming language that is very versatile and can be used to develop applications in platforms such as server-side, Android, JavaScript, and native. The main features of the Kotlin programming language are as follows:

• Concise syntax: Kotlin eliminates a lot of boilerplate code and sticks to the core concepts and functionality
• Safe coding and runtime: Kotlin makes sure errors are minimized during coding and while running the application
• Interoperability: Kotlin code can make use of existing libraries for JVM (ArrayList), JavaScript (document), and many more
• Developer friendliness: Kotlin is supported in a wide array of integrated development environments (IDE) and command line tools to keep the learning curve gradual

The following sections will cover these features, showcasing each with practical examples to enable easy comprehension.