A sales funnel is the path that potential customers are guided along in the process of getting them to purchase your product. It’s called a funnel because of the many customers who approach you, only a few will actually go through until the very end till your billing section. In every stage, a chunk of customers is lost, and the graph resembles the shape of a funnel. A business without a sales funnel is one without any direction.
One could probably write an epic like the Odyssey or the Iliad if we start writing about the importance of engaging a prospect and holding their attention. What wouldn't every marketer and sales professional do, to know the secret recipe of gaining a prospect's undivided attention and knowing what they're looking for!