What they doTraffic you specifically want to keep out
A negative keyword is a term your ad specifically must not appear on. This keeps out search queries that cost money but deliver nothing.
AutomaticExclusions per campaign
Per campaign, AdBuilder generates negative keywords based on the keywords of your other campaign types. This prevents your campaigns from competing with each other and keeps your brand traffic out of your generic campaign.
ReusableShared lists at the project level
In addition, you can set up reusable exclusion lists and a shared competitor list at the project level. These are applied to all your campaigns and, when publishing, are linked to your account as shared negative keyword lists.