What does the 'fun' keyword represent in Kotlin?

The 'fun' keyword in Kotlin is used to declare a function, making it a crucial part of the language's syntax for defining reusable blocks of code that can take parameters and return values. When you specify 'fun', you signal to the compiler that you are about to define a function, which can then be invoked from other parts of your code. This function definition includes the function name, parameter list, and return type, if applicable.

This ability to define functions helps in organizing code, promoting reusability, and improving readability, which are key principles in software development. Functions help to abstract complex operations and are essential for writing efficient and maintainable code. Other terms such as constants, data types, or control flow statements serve different purposes and do not relate to function declaration in this context.