A/B Testing is an experiment comparing two versions of a message, page, ad, or element to see which performs better. In email marketing, this term gives marketers, designers, developers, and business owners a precise way to talk about work that affects visibility, user experience, measurement, and revenue.
In practical email marketing work, the important question is not just what A/B Testing means, but how it should influence decisions. It matters because email is one of the few channels a business can own directly. Strong email fundamentals improve trust, deliverability, segmentation, and long-term lead nurturing.
A strong approach should connect A/B Testing to measurable outcomes such as qualified traffic, calls, form submissions, booked appointments, ecommerce revenue, or lower acquisition costs.
Example
A business might use a/b testing to move a new subscriber from first interest to booked consultation. For example, someone who downloads a local SEO checklist could receive a welcome email, educational follow-ups, a case study, and a final call-to-action to schedule a strategy session.