A Stacked Bar Chart is a visual representation of data that displays the relative sizes of different categories within a single bar. It is used to compare the relative sizes of different categories within a single bar, and to compare the total sizes of different groups of data. The bars are stacked on top
From Wikipedia
A bar chart or bar graph is a chart or graph that presents categorical data with rectangular bars with heights or lengths proportional to the values that they represent. The bars can be plotted vertically or horizontally. A vertical bar chart is sometimes called a column chart and has been identified as the prototype of charts.