# Series

> A chart word, with the charts that use it.

**Definition.** A series is one set of values drawn together, such as one line or one colour of bars. Charts with several series give each its own colour and name.

Updated Nov 2, 2026

## 012 · Multi-line

- **01 One series.** One region's values, joined as one line.
- **02 Its name.** Each series is named in the legend.

## Where you see it

- [012 · Multi-line](https://usechartory.com/charts/multi-line): Change over time · AI data
- [002 · Grouped bars](https://usechartory.com/charts/grouped-bars): Compare items · SaaS data
- [003 · Stacked bars](https://usechartory.com/charts/stacked-bars): Part of a whole · Fintech data

## Common mistakes

- **Too many series** Past five or six the lines tangle. Use small multiples or a horizon chart.
- **Series in different units** Give each unit its own axis, or its own chart.

## Questions

### Series or category?

A category is the group; a series is the values drawn for it.

### How many series fit on a line chart?

Up to about six stay readable.

## Related terms

- [Category](https://usechartory.com/glossary/category): A named group a mark belongs to, such as a plan or a region.
- [Legend](https://usechartory.com/glossary/legend): The key that names each colour or mark.
- [Time series](https://usechartory.com/glossary/time-series): Values recorded at regular moments, drawn left to right.
- [Stacked](https://usechartory.com/glossary/stacked): Parts placed on top of each other so the total stays visible.

## Multi-line, grouped bars, stacked bars and the other types.

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