What is A/B testing and when to use it?

A/B testing is a technique used in web development and marketing to compare two different versions of a web page or application to determine which one performs better. The basic idea is to randomly show one version (Version A) to a group of users and another version (Version B) to another group of users, and then analyze which version resulted in more conversions or better user engagement. A/B testing requires a large enough sample size to ensure statistical significance. This means that you should have sufficient traffic to your website or application in order to generate reliable results. If your traffic is too low, you may consider different ways of optimization, such as user testing.