In some cases it is, e.g. Microsoft Excel graphs.
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Axes, title, Key (if needed, also called a legend), Axis labels
The minimum requirement are data and a key (or legend). No axes are required if the graph is a pictogram.
Line graph
a graph key is when one end of the graph goes into a nother graph and makes baby graphs.
a key on a graph is used to show you what each symbol means