As each individual deal moves through each phase, the probability of closing the sale will change. The further along the sales funnel, the more information is exchanged and more apparent it becomes using the product will be advantageous to the customer. At this point, there is a higher potential for that deal to be ultimately successful unless the deal is moved to closed-lost in which case, the probability moves to zero.
For example, let’s say your business has a blog and social media accounts it uses to get on a potential customer’s radar. From there, you encourage people to download an eBook in exchange for their email and drop them into an email drip that promotes an upcoming webinar. At the webinar, you sell people on your product or service, which convinces them to submit a lead form, work with your sales team and ultimately make a purchase.