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A mapping diagram is a graphic tool that helps to visualize a relation. In a mapping diagram, the inputs are listed in one set and the outputs in another. Then, arrows are drawn from each input to its corresponding outputs.
![A mapping diagram representing the relation {(-2,-8),(-1,11),(0,5),(2,-8)} from the input set [-2,-1,0,2] to the output set [-8,11,5].](/mediawiki/images/0/08/Mljsx_Concept_Representing_Relations_3.svg)
This mapping diagram shows the relation defined by the set {(-2,-8), (-1,11), (0,5), (2,-8)}. Note that -8 is the output of two different inputs, -2 and 2.