Kotlin is a modern, statically-typed programming language developed by JetBrains that runs on the Java Virtual Machine (JVM) and is officially supported for Android development. Since Google announced Kotlin as a first-class language for Android in 2017, it has become the preferred choice for millions of developers due to its concise syntax, null safety guarantees, and seamless Java interoperability. What sets Kotlin apart is its pragmatic design philosophy — it eliminates common programming pitfalls like null pointer exceptions at compile time rather than runtime, provides powerful features like coroutines for asynchronous programming, and lets you write less boilerplate while maintaining full compatibility with existing Java codebases. Understanding Kotlin's type system and its convention-based approach (where language features like operator overloading and property delegation are implemented through specific naming conventions) is key to writing idiomatic, expressive code that feels natural in both Android apps and server-side applications.