A/B testing involves creating different versions of a webpage and showing each version to a similarly sized audience to determine which has a higher conversion rate. The "above the fold" concept of important webpage real estate is less relevant now with mobile devices. Acquisition analytics measures how visitors are attracted to a website and converted into leads through referral traffic, social media, and paid search. Customer experience optimization aims to maximize long-term profitability by increasing customer lifetime value through balancing customer satisfaction, advocacy, and profitability.