Why Learn Kotlin?

Practical reasons Kotlin is worth learning:

• Android — most professional Android apps are written in Kotlin, and Google's modern Android tools, including the Jetpack Compose UI toolkit, are built for it.
• Back-end development — Kotlin works with Spring Boot, the most widely used Java server framework, and has its own lightweight server framework, Ktor.
• The whole Java ecosystem — decades of mature Java libraries work from Kotlin with no extra effort.
• A pleasant, safe language — null safety, data classes, and concise syntax make everyday code shorter and less error-prone.
• Sharing code across platforms — Kotlin Multiplatform lets a team write business logic once for Android, iOS, desktop, and web.

Trade-offs worth knowing up front: Kotlin projects usually build with Gradle, which has a learning curve of its own, and compiling is slower than with some languages. For iOS-only apps, Swift is the natural choice, and for data science, Python has the larger ecosystem.