CRO (conversion rate optimization) is a process of increasing sales by improving the user experience on a website. It involves observing user behavior data from tools like Google Analytics to find areas for improvement ("leaks"), gathering additional data through user testing and clickstream analytics, then testing variations through A/B or multivariate testing. An example is described of a football pitch provider that saw a 73.1% uplift in conversions and a six figure increase in sales by streamlining their checkout process based on insights from these CRO techniques.