Attribution in digital marketing shows what actually works by tracking how users interact with multiple ads before making a purchase. The process starts when a user sees and clicks an ad, visits the website, then may see and click another ad before buying. Attribution models assign credit to each ad that helped influence the purchase, not just the last one. This way, marketers understand which ads contributed to the sale and can make better decisions. The execution table traces each user action and how credit is assigned step-by-step. Variable tracking shows how user awareness and attribution credit change over time. Key moments clarify why credit is shared and why looking only at the last ad is misleading. The visual quiz tests understanding of when purchase happens, credit percentages, and effects of missing clicks. Overall, attribution reveals the true impact of marketing efforts by showing what actually works.