Difference between return and print/puts??

Question

What is the main mechanism behind these two?
Let's suppose:

def sum(a, b)
puts a+b
end

x = sum(5, 23)
puts x

The same code can also be written as:

def sum(a, b)
return a+b
end

x = sum(5, 23)
puts x

Answer 1

'puts' or 'print' just prints out the value on the screen - that's it.

'return' assigns the result value to the function. You can do whatever you want with it - assign it to a variable or you use it calculations.

Answer 2

Ruby does, Python does NOT ('show the value of the last expression in your code')

Answer 3

print --> prints its argument.
puts --> also prints its argument, but inserts a newline character at the end, so each argument (or each puts call) appears on its own line.
return --> doesn’t print at all. The only reason you get the same output is that Ruby or Python language shows the value of the last expression in your code.