A conversion funnel visualizes the journey from first visit to completed conversion. The name comes from the shape: lots of people enter the top (visit your page), fewer make it to the middle (engage with content), and fewer still reach the bottom (convert). A typical landing page funnel might be: ad click → page view → scroll past fold → CTA click → form completion.
The power of funnel thinking is that it tells you where you're losing people. If 10,000 people visit and 100 convert (1%), that's a funnel problem somewhere. But where? If 8,000 bounce immediately, your issue is above the fold. If most visitors scroll and engage but don't click the CTA, your offer or button is the problem. Different drop-off points require completely different fixes.
Measuring your funnel
Set up funnel tracking by defining each step as a measurable event: page load, scroll milestones (25%, 50%, 75%), CTA visibility, CTA click, form interaction, form submission. Compare the drop-off between each step. The step with the biggest percentage drop is your highest-leverage optimization target.
One mistake: obsessing over the bottom of the funnel. If your CTA-click-to-form-completion rate is 30%, that's probably fine. If your page-view-to-scroll rate is 40%, you're losing 60% of visitors before they see any of your content. Fix the top of the funnel first — it has the biggest absolute impact.