A plot style table is a collection of plot styles assigned to a layout or the Model tab. A plot style is an object property, similar to linetype and color. A plot style can be assigned to an object or assigned to a layer. A plot style controls an object's plotted properties.
You can also create a new plot style table to save in the page setup for the layout or edit an existing plot style table.
If you select the Display Plot Styles option under Plot Style Table (Pen Assignments), the properties of the plot styles assigned to objects are displayed in the selected layout.