An attribution window is the period after a click or an impression during which a subsequent conversion is still credited to the ad. The window might for example be seven days after a click and one day after a view. Its length affects how many conversions a channel is credited with.
With a seven-day attribution window, a purchase made five days after the click still counts as a conversion for the ad.
Book a free 30-minute call and we will translate the theory into something that moves your numbers.