At Zapier, they use attribution to understand how customer actions result in business outcomes, giving a holistic view of how each touchpoint contributes to user behavior. They have three main attribution methods: first-touch, last-touch, and linear. First-touch attribution gives credit to the first interaction with the brand, while last-touch attribution gives credit to the last interaction before conversion. Linear attribution, on the other hand, assigns equal weight to all interactions leading up to a conversion event. These attribution methods can help businesses understand how their activities influence customer behavior and make data-driven decisions to drive growth.