A/B testing is a form of content testing. The method essentially splits a recipient list into two. Then the same email except with slight variants and changes is sent across. The aim is to determine which emails were better received by the target audience. This method helps improve not just the content of the emails you send out but also improves the layout and the entire look. Using A/B testing is a highly ideal format through which you can both understand and fulfill the needs of your customers.