The final step in the process is to figure out which metrics you’ll track to determine how well your funnel is functioning. It’s crucial to work with the SQL and MQL data here to track patterns between who closes and how they interact with your site, content, channels, ads, etc. Once you have more information, you can continuously optimize your funnel

If you're wondering what a sales funnel is, simply imagine a real-world funnel. At the top of that funnel, some substance is poured in, which filters down towards one finite destination. In sales, something similar occurs. At the top, lots of visitors arrive who may enter your funnel. However, unlike the real-world funnel, not all who enter the sales funnel will reemerge out from the other end.