Re: Attribution Modelling
Basically Attribution model refers to the way how you want to evaluate the number of clicks that resulted in a conversion on your website. It could be first click, last click or the combination of multiple steps. Based on your customer business model, you can decide and apply that model within your advertising account.
Here's one example of attribution model for better understanding:-
You can read about more insights here in the original doc:- https://support.google.com/adwords/answer/6259715?hl=en
I hope this helps!