A unique value renderer is a rendererA renderer is a collection of rules and symbols used to display the data in a layer.Learn more that defines a distinct symbolA symbol defines the properties used to display a geometry or text.Learn more for each unique data value returned from a field or expression in a layerA layer is a reference to a collection of geographic data that is used to access and display data. The data for layers are typically provided by the basemap layer service and data services.Learn more. This is typically used to visualize categories or data types.