An attribute group is a set of related attributes that share a common purpose.
For example, you can define an attribute group called Performance that contains Performance-related attributes for different types of items. You can then assign CPU Speed and CPU Type as Performance attributes of Computers and Acceleration as a Performance attribute of Toy Cars.
Multiple levels of attribute groups allow you to easily manage large numbers of attributes by prioritizing and organizing attributes. If the business in the example provided in the previous paragraph wants to emphasize its computer-related products, CPU Speed and CPU Type can be listed higher in the attribute group's hierarchical tree than Acceleration, the Toy Car-related attribute.