In plain English
It defines how long after seeing or clicking an ad a conversion still counts, and whether views count at all. A seven-day click window reports more conversions than a one-day window for identical activity.
Which is why comparing performance across different settings is meaningless. The same campaign looks better or worse depending only on the window chosen.
What to know
Why it matters
Many arguments about whether Meta is working are really arguments about attribution windows. Fixing one setting and reporting on it consistently removes most of that noise.
Common mistakes
FAQs
Which setting should I use?
One, consistently. Seven-day click is a common default.
Do view-through conversions count?
They indicate influence, not proven causation. Report them separately.
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