Which type of chart is best for categorical data

A vertical bar chart displays categories on one axis and frequencies or percentages on the other so comparisons are clear. Bars have equal width and separate gaps which suits discrete groups like grade levels subjects or regions. Unlike a histogram that is for continuous intervals the bar chart does not assume numeric continuity between categories. A pie chart shows parts of a whole but becomes hard to compare many slices. Bar charts allow quick ranking and highlight largest or smallest groups. Teachers use them to present attendance results survey choices or assessment mastery by topic during staff reviews.