As you are setting up your AdWords campaigns, you have the option to choose your targeting preferences more broadly to maximize your ad reach, or to restrict targeting to ensure ads are only showing to your very specific audience. Who will end up seeing your ads will depend on the campaign settings you choose as you create your campaigns.
The first setting you'll need to consider when creating your campaigns will be which networks you'd like to show ads on. Google has two main networks through which ads are served:
Includes Google.com, Google properties such as Google Maps, and search partners, such as AOL.com.
Ads are text based.
Display network
Includes Gmail, YouTube, and millions of partner websites, such as nytimes.com, where your potential customers could be reading the news or articles related to your products.
Ad formats include: text, image, video, and rich media.