Conversion rate optimization (CRO) is a systematic process of getting more visitors to take a specific desired action on a website or app. It involves setting goals, measuring data, analyzing insights, testing hypotheses, and continually optimizing based on results. The key is to move away from random guesses and instead understand visitor behavior through analytics, heuristics testing, A/B testing, and other techniques to identify areas that reduce friction or increase motivation for conversions. Done effectively, CRO is essential for growing a business as search engine optimization and pay-per-click advertising become more difficult and expensive.