In internet marketing, conversion optimization, or conversion rate optimization (CRO) is a system for increasing the percentage of visitors to a website that convert into customers, or more generally, take any desired action on a webpage. Conversion rate optimization (CRO) is the process of optimizing your sponsored search ads, landing pages, and overall website design to raise your conversion rate. CRO is quickly gaining in popularity because it’s seen as a way to increase profits from sales without raising your advertising spends.