What is a Marketing Funnel?

A marketing funnel (purchase funnel, conversion funnel) models the customer journey from first contact with a product to purchase and repeat transactions. In marketing it is shown as a sequence of stages where part of the audience drops off at each step — hence the funnel metaphor.

Classic stages

The model ties to AIDA (Attention — Interest — Desire — Action):

Awareness — the user learns about the product or problem (ads, organic, referral).
Interest — compares options and seeks information (pre-landing, review, quiz).
Desire — ready to act; trust and proof matter (testimonials, guarantees, offer).
Action — conversion: lead, signup, purchase, deposit.

After the first purchase, retention and repeat revenue (rebill, upsell, cross-sell) matter — especially in nutra, subscriptions, and gambling.

TOFU, MOFU, BOFU

TOFU (top of funnel) — reach, first click, brand exposure.
MOFU (middle) — nurture, consideration, retargeting.
BOFU (bottom) — decision and conversion; includes re-engagement for abandoned leads.

Funnel in traffic arbitrage

In arbitrage, a “funnel” is a concrete chain of assets and events:

ad click → tracker → pre-landing (optional) → landing → lead/sale;
affiliate postback records conversion at a defined step;
rebills and upsells raise LTV and change ROI math.

Funnel metrics are CR between steps: ad CTR, landing CR, advertiser approval rate. The step with the largest drop-off is the priority for split tests.

Funnel analytics

Trackers and BI tools report how many clicks become lead, sale, rebill. This differs from a tracker campaign flow (routing rules by offer), though the words overlap in conversation. The e-commerce conversion funnel applies the same idea: traffic sources → pages → checkout → purchase, with retargeting at exit points.

Mapping the funnel avoids optimizing CPC alone when the pre-landing or final CTA fails, and helps allocate budget by stage, not only at the top.

See also: landing page, conversion, CR, split testing.