Graph

A graph is a term applied to any number of types of two-dimensional diagrammatic or symbolic depiction of relationships of variable quantity changes. Several variables can be shown on a graph, plotted against two or more axes. One of the axes may be the variable of time; others may represent particular expressions of the abstract ideas of 'value', or 'energy', or they may represent unit quantities, depicted in scale of anything whose rate of change is desired to be studied in relation to other rates of change.