A key can make it easier to interpret the data sets that each part of the graph represents, especially if there is no room in the graph area for labels.
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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
You need a key so people can see what the picture your picture graph uses means.
The minimum requirement are data and a key (or legend). No axes are required if the graph is a pictogram.
The "key" tells you what the line(s) of plotted data on a graph represent (e.g people, money, time etc...) without this information the graph is meaningless because it is incomprehensible.