Bar Chart
A bar chart is a data visualization tool that represents categorical data with rectangular bars, where the lengths or heights of the bars are proportional to the values they represent. It is commonly used to compare discrete categories or track changes over time when data points are distinct. Bar charts can be oriented horizontally or vertically, with vertical bar charts often called column charts.
Developers should learn bar charts for creating clear, intuitive visualizations in applications like dashboards, reports, and analytics tools, especially when comparing quantities across categories such as sales by region or user engagement metrics. They are essential in data science, business intelligence, and web development for presenting data in an accessible format that supports decision-making and user comprehension.