Enum containing possible user list types.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v26/enums/user_list_type.proto)

| Enums ||
|---|---|
| ## `CRM_BASED` | UserList of first-party CRM data provided by advertiser in the form of emails or other formats. |
| ## `EXTERNAL_REMARKETING` | UserList created in the Google Ad Manager platform. |
| ## `LOGICAL` | UserList represented as a combination of other user lists/interests. |
| ## `LOOKALIKE` | LookalikeUserlist, composed of users similar to those of a configurable seed (set of UserLists) |
| ## `REMARKETING` | UserList represented as a collection of conversion types. |
| ## `RULE_BASED` | UserList associated with a rule. |
| ## `SIMILAR` | UserList with users similar to users of another UserList. |
| ## `UNKNOWN` | Used for return value only. Represents value unknown in this version. |
| ## `UNSPECIFIED` | Not specified. |