The primary distinction between Histograms and Bar Graphs is that the Bars in a Bar Graph are not next to each other, but the Bars in histograms are. A Bar Graph is a Graphical representation of exact Data made up of rectangular Bars with equal gaps between them, whereas a histogram can be termed as a Graphical representation of Data made up of rectangular Bars with no gaps.Histograms are used to represent distributions of variables and plot quantitative Data such as Data of population changes every year, marks obtained, and monthly salary, whereas Bar Graphs are used to compare various variables and are used to plot categorical Data such as Data of types of animals, types of colours, types of movies, and so on.Bar Graphs are used to compare various variables and are used to plot categorical Data such as Data of types of animals, types of colours, types of movies, and so on.