AI-generated Key Takeaways
- 
          This content defines and describes different types of optimization goals, including unspecified, unknown, call clicks, driving directions, and app pre-registration. 
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          Each optimization goal represents a specific action or event that advertisers can aim to achieve, such as generating calls, getting directions, or securing app pre-registrations. 
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          The different enum values correspond to these optimization goals, providing a structured way to identify and categorize them. 
The type of optimization goal
| Enums | |
|---|---|
| 
 | Not specified. | 
| 
 | Used as a return value only. Represents value unknown in this version. | 
| 
 | Optimize for call clicks. Call click conversions are times people selected 'Call' to contact a store after viewing an ad. | 
| 
 | Optimize for driving directions. Driving directions conversions are times people selected 'Get directions' to navigate to a store after viewing an ad. | 
| 
 | Optimize for pre-registration. Pre-registration conversions are the number of pre-registration signups to receive a notification when the app is released. |