Detailed definition
A user sees the brand across 5-10 different channels before buying (Google Ads → organic → Instagram → email). Which one gets the "credit"? The models: Last Click (the final click takes everything), First Click (the first click), Linear (shared equally), Time Decay (more weight closer to the conversion), Data-Driven (Google AI). GA4 and Google Ads use Data-Driven by default.
Examples
- The same sale goes entirely to organic under Last Click, but is split between Google Ads, Instagram and organic under Data-Driven.