In this episode of The PPC Den, Mike from AtBadger discusses the concept of a negative keyword reset in Amazon PPC. He emphasizes the importance of negative keywords for efficient ad spending and low ACoS, but suggests strategically removing them periodically. This is because a product's strength, market conditions, and seasonality can change over time, making previously blocked search terms potentially valuable. Mike outlines methods for performing a negative keyword reset, including bulk resets, campaign-by-campaign resets, and strategic resets based on time or theme. He also shares personal tips on how to implement these resets using bulk files and the Badger software, encouraging listeners to reconsider their negative keywords and give relevant terms a second chance to improve sales.