Visitors come to your websites as potential leads, If they fill out your lead capture form they then become leads. By filling out your form, they have given you permission to send them emails. Those who buy immediately become customers. But what about those who are still undecided? They are still your prospects. So you send them a series of auto-responders, develop and nurture your relationship with your prospects by continuing to provide valuable information they need and want. Make your brand stand out and they will come back to you when they are ready to make a purchase. You have now completed your sales funnel: visitors, leads, prospects, customers and profit.