This visual execution shows how attribution models assign credit for a purchase based on user ad interactions. The user clicks Ad1, then Ad2, then buys a product. The last-click model waits until purchase and assigns all credit to Ad2, the last ad clicked. The multi-touch model shares credit between Ad1 and Ad2, giving partial credit to each ad the user interacted with. Variable tracking shows how credit changes step-by-step. Key moments clarify why last-click gives full credit to the last ad and how multi-touch splits credit. The quiz tests understanding of credit assignment timing and differences between models. This helps beginners see how marketing attribution works in practice.