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A lambda expression in Kotlin is a way to define a function-like construct without explicitly declaring a function. It allows you to create a block of code that can be passed around as an argument or stored in a variable.
val sum = { a: Int, b: Int -> a + b } // Lambda expression
val result = sum(3, 4) // Invoking the lambda expression
println(result) // Output: 7
In the example, we define a lambda expression called sum that takes two Int parameters and returns their sum. The lambda expression is then invoked by passing arguments 3 and 4, resulting in a value of 7. Lambda expressions are concise and useful for providing inline function behavior.