This document discusses how SEO and conversion rate optimization (CRO) work together to increase leads, sales, and revenue. SEO widens the top of the marketing funnel by bringing in organic search traffic, while CRO makes the bottom of the funnel larger by improving how incoming traffic converts into customers. Real-world examples show how SEO traffic alone can generate hundreds of thousands of monthly visitors and thousands in sales. While combining SEO and CRO carries some risks like potentially hurting search rankings, the rewards can be significant through testing and optimizing landing pages and content to substantially increase conversion rates and revenue from existing organic traffic flows.