Which scenario would require you to immediately re-evaluate the relevance of your existing keyword groupings, regardless of historical performance?

A significant shift in user search behavior or market trends would require an immediate re-evaluation of existing keyword groupings, regardless of historical performance. Keyword groupings are collections of keywords organized into tightly themed ad groups to improve ad relevance and Quality Score. These groupings are typically based on keyword similarity and search intent at a specific point in time. However, user behavior and mark....