Trace Plots 3D
As in 3D Scatterplots, each data point in Trace Plots is represented by its location in 3D space as determined by the values of the variables selected as X, Y, and Z (and interpreted as the X, Y, and Z axis coordinates). The data points are then connected sequentially (in the order encountered in the data file) with a line to form a "trace" of a sequential process (e.g., movement, change of a phnomenon over time, etc.).
A good metaphor of the information that is best represented in a trace plot is that of the trajectory of an object in three-dimensional space.