Could you explain what is meant by the term 'function' in programming?

In programming, a function is a named block of code that performs a specific task and can accept input data (parameters), as well as return a result. Functions help structure the program, reuse code, and simplify understanding.

Example of a function in Swift (iOS):

func greet(name: String) -> String {
    return "Hello, \(name)!"
}

let message = greet(name: "Alexey")
print(message) // Outputs: Hello, Alexey!

Here, the greet function takes a name and returns a greeting message.