A negative blocks a term so your ads stop showing for it. This is where most wasted spend gets recovered.
A term is suggested as a negative when:
Relevance is at or below 20% - it clearly doesn't match your keywords.
Wasted spend is at or above 2.0x target cost per sale.
Conversions are 0 (or, on ROAS campaigns, it returned no conversion value at all).
Auto-applied negatives are exact by default, so a negative can't accidentally carry a core money-word and over-block. Phrase is available when you choose it; broad is never used automatically. You also choose whether each negative applies at ad-group or campaign level.
Campaign level: stronger; blocks the term everywhere. Best for terms that are clearly unwanted across the whole campaign.
Ad-group level: safer when a term is wrong here but could be useful in another ad group.
How to apply:
Open the Negatives queue.
For each term, confirm the match type and the level (ad-group or campaign).
Select rows and Apply - bulk for the obvious junk, individually for borderline calls.
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