A sankey diagram is a visualization used to depict a flow from one set of values to another. The things being connected are called nodes and the connections are called links. Sankeys are best used when you want to show a many-to-many mapping between two domains (e.g., universities and majors) or multiple paths through a set of stages (for instance, google Analytics uses sankeys to show how traffic flows from pages to other pages on your web site).

A visual representation of a data tree, where each node can have zero or more children, and one parent (except for the root, which has no parents). Each node is displayed as a rectangle, sized and colored according to values that you assign. Sizes and colors are valued relative to all other nodes in the graph. You can specify how many levels to display simultaneously, and optionally to display deeper levels in a hinted fashion. If a node is a leaf node, you can specify a size and color; if it is not a leaf, it will be displayed as a bounding box for leaf nodes. The default behavior is to move down the tree when a user left-clicks a node, and to move back up the tree when a user right-clicks the graph.

The total size of the graph is determined by the size of the containing element that you insert in your page. If you have leaf nodes with names too long to show, the name will be truncated with an ellipsis (...).

A geochart is a map of a country, a continent, or a region with areas identified in one of three ways:

• The region mode colors whole regions, such as countries, provinces, or states.
• The markers mode uses circles to designate regions that are scaled according to a value that you specify.
• The text mode labels the regions with identifiers (e.g., "Russia" or "Asia").

A geochart is rendered within the browser using SVG or VML. Note that the geochart is not scrollable or draggable, and it's a line drawing rather than a terrain map; if you want any of that, consider a map visualization instead.

A candlestick chart is used to show an opening and closing value overlaid on top of a total variance. Candlestick charts are often used to show stock value behavior. In this chart, items where the opening value is less than the closing value (a gain) are drawn as filled boxes, and items where the opening value is more than the closing value (a loss) are drawn as hollow boxes.

A diff chart is a chart designed to highlight the differences between two charts with comparable data. By making the changes between analogous values prominent, they can reveal variations between datasets.

You create a diff chart by calling the computeDiff method with two datasets to generate a third dataset representing the diff, and then drawing that.

A trendline is a line superimposed on a chart revealing the overall direction of the data. google Charts can automatically generate trendlines for Scatter Charts, Bar Charts, Column Charts, and Line Charts.

google Charts supports three types of trendlines: linear, polynomial, and exponential.

Stick intervals display pairs of columns as a set of sticks parallel to the target axis. A stick of zero height is rendered as a point, which can be suppressed by setting the pointSize option to zero.