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I think function could be related in real life as a person, which is the domain, should be for one person only (range) and relation as a set of couples (ordered pair).

Not sure but hope I helped. :)
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Based on my math teacher ,"FUNCTION" is a special type of relative such that no two ordered pairs of the set have different second coordinate corresponding to the first coordinate.
While "RELATION" is a set of ordered pair of mathematical quantities.
Example of Function & Relations:
   (4 , 8) x = 4
f(x) = 4x - 8
   y = 4(4) - 8
      =16 - 8
       = 8

:)) , (ahm do i need to explain my example??)
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