As you can see, each color-coded section of the funnel pictured above corresponds to a stage in the buying process. The widest tier at the top of the funnel represents “awareness,” the point at which potential customers are beginning their information search. The second tier is “interest,” roughly corresponding to the evaluation of alternatives described in the purchase process above. And, finally, the third and fourth tiers, “desire” and “action,” are self-explanatory.
In marketing automation, Ryan Deiss, co-founder of Digital Marketer, often describes the sales funnel as a multi-step, multi-modality process that moves prospective browsers into buyers. It's multi-stepped because lots must occur between the time that a prospect is aware enough to enter your funnel, to the time when they take action and successfully complete a purchase.