How to pass a method as a parameter to another method in C#?

Hello everyone! I just started learning C# and encountered this problem. I have several methods that do almost the same thing, but with slight differences in logic. For example, I want to apply some operation to an array of numbers: either sum all elements, multiply them, or find the maximum. Instead of writing three separate loops, I would like to write one universal method that takes an "action" (another method) and applies it to the array. I tried to do it like this: ```csharp public void ProcessArray(int[] numbers, ??? operation) { for (int i = 0; i < numbers.Length; i++) { numbers[i] = operation(numbers[i]); } } ``` But I don't know what to write instead of `???`. I've heard about delegates, but I don't understand how to properly declare and use them. Can you