Different chart types are optimized for different kinds of data and stories. Choosing the right chart type makes your data easier to understand and more impactful.
Bar Charts - Comparing Categories
Bar charts excel at comparing discrete categories. Use them for: comparing sales across products, showing survey responses, ranking items. Horizontal bars work better for long labels. Vertical bars work better for time-based categories (months, years). Use grouped bars for comparing multiple series across categories.
Line Charts - Showing Trends Over Time
Line charts show how values change over time. Use them for: stock prices, website traffic, temperature changes, growth metrics. The continuous line emphasizes the trend. Multiple lines can show comparisons (e.g., this year vs last year). Avoid line charts for categorical data without a natural order.
Pie Charts - Part-to-Whole Relationships
Pie charts show how parts make up a whole (must sum to 100%). Use them for: market share, budget allocation, survey demographics. Limit to 5-7 slices maximum. Avoid pie charts when comparing similar values (hard to distinguish) or when values don't represent parts of a whole. Doughnut charts are a modern alternative.