A/B testing in email marketing means sending two different versions of your email to a small part of your list to see which one gets better results. You can test things like your subject line, call to action, email design, or even the affiliate offer itself. For example, you could send one email with a short subject line and another with a longer one to see which gets more opens. Or, you can test two different buttons to see which one gets more clicks. After the test, you send the better-performing version to the rest of your list. This helps you improve your results and learn what your audience responds to. Keep your tests simple, change only one thing at a time, and track your results carefully. Even small changes can make a big difference over time. What parts of your emails would you be interested in testing first?