To measure the impact of display ads on organic search traffic, use a combination of analytics tools and attribution models. Start by comparing organic traffic trends before, during, and after a display campaign using tools like Google Analytics. Segment traffic by source to isolate organic search. Track branded keyword searches, as display ads often increase brand awareness that drives these queries. Utilize assisted conversions and view-through data to see if display exposure indirectly influences search behavior. A/B testing with control groups that don't see display ads can further validate impact. Google Search Console also helps monitor changes in impressions and clicks for organic listings. Together, these insights reveal whether display ads contribute to increased organic visibility, traffic, or engagement, helping justify cross-channel marketing investments.