Kotlin DSL is a domain-specific language that uses Kotlin features to provide a readable, declarative syntax with minimal boilerplate code. It exploits Kotlin's capabilities like lambdas and infix notation to write code in a DSL-like style with little effort. As an internal DSL built on Kotlin, it does not have its own syntax but rather is a library that offers a DSL interface. Kotlin DSL promises benefits like static typing, enhanced IDE support, interoperability, maximum readability, and consistency through using the same language for code and configurations.