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Verified Answer :

A function is a
special kind of relation. Relations pair up x and y coordinates, either
by listing them (explicitly) or by writing an equation (implicitly).
Functions have the additional property that no two values of y have the
same value of x. Put another way, if you view x as the input and y as
the output, functions have the property that each input yields only one
output.

TheBlueFox

A relation is any set of ordered pairs.

For example, {(5,9), (1,2), (8,11), (10,20), (4,7)}

A function is a special type of relation where each x-coordinate has exactly 1 y-coordinate.

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