Kotlin is a modern, general-purpose programming language that's gaining popularity for several reasons:

1. Cross-platform:  Kotlin can be used to develop applications for various platforms like Android, iOS, web browsers, and even desktop environments. This makes it versatile for programmers who don't want to be confined to a single platform.
2. Interoperable with Java:  One of Kotlin's biggest strengths is its seamless integration with Java. Kotlin code can be used alongside Java code in the same project, making it a great choice for developers who want to gradually introduce Kotlin into existing Java projects.
3. Concise and Safe:  Kotlin is known for its clean syntax, which allows developers to write expressive code with fewer lines compared to Java. Additionally, it prioritizes code safety by employing features like type inference and immutability to prevent errors.
4. Easy to Learn:  If you're already familiar with programming languages like Java or C#, learning Kotlin should be a breeze. Its syntax borrows elements from these languages, making it approachable for programmers with some experience.
5. Large Community and Support:  Kotlin is backed by JetBrains, a well-respected company in the developer community. This translates to a wealth of learning resources, tutorials, and libraries available online.

Here's a breakdown of Kotlin's applications:

1. Mobile App Development:  Kotlin is a first-class language for Android app development, often preferred by developers for its conciseness and safety features.
2. Web Development:  Kotlin can be compiled to JavaScript using Kotlin/JS, allowing developers to build web applications that leverage Kotlin's strengths.
3. Server-Side Development:  While less common than mobile development, Kotlin can also be used for server-side development thanks to frameworks like Ktor.
4. Data Science:  Kotlin is not exclusively for traditional software development. Its data manipulation capabilities make it suitable for data science tasks as well.

Overall, Kotlin is a versatile and powerful language worth considering for your next development project, especially if you're looking for a language that's concise, safe, and can target multiple platforms.