What is the difference between PHP echo and PHP return in plain English?

Yes, I have goggled this question and even referred to my textbook (PHP by Don Gosselin) but I seriously cannot understand the explanations :-( (I feel dumb)

From my understanding:

echo = shows the final result of a function

return = returns the value from a function

I applied both echo and return in the following functions I cannot see the difference or the 'effectiveness' of using return instead of echo.

<?php
echo "<h1 style='font-family:Helvetica; color:red'>Using <em>echo</em></h1>";
function add1($x, $y){
    $total = $x + $y;
    echo $total;
}
echo "<p>2 + 2 = ", add1(2, 2), "</p>";

echo "<h1 style='font-family:Helvetica; color:red'>Using <em>return</em></h1>";
function add2($x, $y){
    $total = $x + $y;
    return $total;
}
echo "<p>2 + 2 = ", add2(2, 2), "</p>";

?>

Both display the result! What am I not understanding? :(

Please bear with me!

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