A scatter chart draws a single point for each point of data in a series without connecting them.
#Scatter chart features
An important distinction between a scatter series and a line series is that the scatter series doesn't require sorting because the mouse tracker for the tooltip is activated on each single marker. A line can be drawn between the markers by setting the lineWidth option to something higher than 0.
For an overview of the scatter chart options see the API reference.
#3D scatter charts
In 3D charts, the scatter points also have a Z dimension. This is handled by a separate series type, scatter3D.