It can be used to create objects, often referred to as an instance. SpatialReference and Extent are examples of arcpy classes, arcpy classes are often used as shortcuts to complete a geoprocessing tool parameters. arcpy includes several predefined classes, including SpatialReference, ValueTable, and Point. Once instantiated, its properties and methods may be used. Classes have one or more methods called constructors. A constructor is a method for initializing a new instance of a class. More test answers on https://studyhippo.com/8138-arcgis-3-review-6073/