Use environment targeting to set the serving environment for your ads.
- Web: Target inventory displayed in browsers.
- App: Target inventory displayed in apps.
For the web environment, inventory not optimized by device type is included in your targeting by default. This means that you’ll automatically target inventory that’s not designed for a device but viewed on it, such as sites that are optimized for desktop but viewed on mobile devices. You can uncheck this option to exclude this inventory from your targeting.