Why would a C# method not return a value?

It's easy to understand why method() returns a value - but I can't wrap my head around the concept of a method that doesn't return a value.

static void PrintName(string firstName, string lastName)
{
    Console.Writeline($"{firstName} {lastName}");
}

This method prints firstName and lastName to the console, but doesn't return a value. Why would a programmer do that? How is it used?

Solution

Think of methods that return a value as if they're an answer to a question:

Q: What's today's date?
A: April 15, 2022.

public string GetDate() { return DateTime.Now.ToShortDateString(); }

Think of methods that don't return a value as an action executed based on a request.

Person 1: Please put this mug on the table.
Person 2: *puts the mug on the table* - doesn't need to say anything

public void PutMugOnTheTable(Mug mug) { Table.Items.Add(mug); }