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Confusion about the void and what it means.

I am very new to programming and confused by what void does, I know that when you put void in front of a function, it means "it does not return anything", but if the function does not return anything, then what is the writing point of the function ?? In any case, I asked this question in my homework and try to answer it, but I need help with the general concept. any help would be great, and please try to avoid technical jargon, I'm a serious beginner here.

What does this function do?

void add2numbers(double a, double b) 
    { 
       double sum; 
       sum = a + b; 
    }
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10 answers
void ReturnsNothing() 
{
     cout << "Hello!";
}

As you can see, this function does not return anything, but this does not mean that the function does nothing.

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void add2numbers(double a, double b, double &sum) 
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}

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