The title of a graph should be an indication of the information that the graph is meant to convey. It may not be a direct description of the data but it should certainly be relevant to the data being used.
For example, a graph showing number of residents against years might have a title of "Growth in the town". The title refers not to the data but to the information the graph is showing.
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To make a good graph title, just state what your graph is about. If the line graph (example) shows the population of England, your graph title should be 'Population of England Over Time'.
to tell them why you made this graph
Because it should help indicate what the graph is about.
Yes, you need to title a histogram graph.
I know two parts of making a bar graph is Title, and Labels.