# Graphs > Dygraphs

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### Dygraphs is a fast, flexible open source JavaScript charting library.

##### Features

- Handles huge data sets: dygraphs plots millions of points without getting bogged down.
- Interactive out of the box: zoom, pan and mouseover are on by default.
- Strong support for error bars / confidence intervals.
- Highly customizable: using options and custom callbacks, you can make dygraphs do almost anything.
- dygraphs is highly compatible: it works in all major browsers (including IE8). You can even pinch to zoom on mobile/tablet devices!
- There's an active community developing and supporting dygraphs.

#### JavaScript Example

    new Dygraph(div, "ny-vs-sf.txt", {
      legend: 'always',
      title: 'NYC vs. SF',
      showRoller: true,
      rollPeriod: 14,
      customBars: true,
      ylabel: 'Temperature (F)',
    });

## No roll period

## No roll (timestamp)

Roll period of 14 timesteps, custom range selector height and plot color.