To raise awareness of what you’re advertising without limiting who might see your ads, you should:

To raise awareness of what you’re advertising without limiting who might see your ads, you should:

• add multiple targeting methods and use the “Target and bid” setting
• set a topic bid adjustment to show your ads on multiple pages about a specific topic
• set a mobile bid adjustment to reach more customers on mobile devices
• add multiple targeting methods and use the “Bid only” setting

Explanation: Doesn’t restrict your ads to showing for the targeting method you’ve selected

Read more here: https://support.google.com/adwords/answer/1209882?hl=en