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Mobile Apps Exclusion
This optimization allows you to exclude all the low-performing mobile app placements that are costing you money but not resulting in any conversion.
The tool will list out all your mobile app placements with exactly 0 conversions in the last 30 days and with costs greater than zero.
You can exclude both types of automatic placements; for IOS and Android apps at the ad-group level in bulk.
Display Placements Exclusion
With the Display Placements Exclusion optimization, you can find placements that are resulting in wasted spend and exclude them based on a business goal – Branding, Traffic, or Conversions. This tool also makes it possible to see sites that are part of search partners and exclude them.
Account-Level Placement Exclusions
Excluding placements from an account helps prevent your ads from showing up on certain placements on the Display network or YouTube, overriding any campaign-level placement targeting.
For some cases, as with Smart Shopping and Smart Display campaigns, account-level placement exclusions are a great solution, as Google doesn't support excluding placements through a negative list or by excluding them at the ad group level.