The marketing funnel is a model that shows the different stages of a marketing process. The TOFU (Top of the Funnel) stage is where marketing starts, and it's where the majority of their efforts are focused on getting new traffic. The MOFU (Middle of the Funnel) stage is when marketers see some success but still have work to do to get more people in their funnel. The BOFU (Bottom of the Funnel) stage is when they have enough leads coming in to start turning them into customers. The TOFU, MOFU, and BOFU stages are not exclusive to online marketing but can also be used for offline campaigns as well.