The type of the listing group.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v25/enums/listing_group_type.proto)

| Enums ||
|---|---|
| ## `SUBDIVISION` | Subdivision of products along some listing dimension. These nodes are not used by serving to target listing entries, but is purely to define the structure of the tree. |
| ## `UNIT` | Listing group unit that defines a bid. |
| ## `UNKNOWN` | Used for return value only. Represents value unknown in this version. |
| ## `UNSPECIFIED` | Not specified. |