When the data consist of frequency for a set of qualitative categories, or when there are a small number of discrete quantitative categories or even a set of classes of equal width.
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It's a stacked bar chart.
You can use a stacked bar chart.
A bar chart is used when you have a standard column and a variable column, it is used to indicate the differences of the variable in each of the standard.
Although the terms are often used as synonyms they are not the same. A Gantt chart is a specific type of bar chart. Gantt did not invent the bar chart, the concept of bar charts pre-date Gantt's work by at least a century. The erroneous description of a bar chat as a Gantt chart and the belief that Gantt invented the bar chart probably results from the decision of Microsoft, in 1984/1985, to misname the bar chart view in its scheduling tool Microsoft Project as a Gantt chart. See 'Where did the Misuse of the names Gantt and PERT Originate?'. P Weaver. PM World Journal, Vol. II, Issue IV, (April 2013).
A composite bar chart is whereby each bar displays multiple data points stacked in a single row or column. On the other hand multiple bar graph are usually placed side by side and use different shapes to contrast between them.