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A/B Testing is a method where two different versions of a website pages are sent out to users at the same time. After some period, the number of people who click on each version of the page is counted. Based on these results, the best performing version of the page is chosen and implemented across the site.
Web designers to determine which design performs better commonly use this technique. In email marketing, A/B testing is often used to compare the effectiveness of various email campaigns.
A/B testing is a great way to test different variables at once. You can use it to compare two things at once, or you can use it to compare one thing over time.
https://www.massmailservers.net/a-b-testing-in-email-marketing