Showing two versions of a page, ad or email to similar audiences to see which performs better.
In plain words
An A/B test changes one thing and measures the difference. It needs enough visitors to be trustworthy; declaring a winner too early is a common mistake.
Questions to ask a company that offers this
How long will each test run?
How do you decide a result is real?
A good company will answer these plainly and in writing. Vague or evasive answers are worth noting.
Explanation last read through on 25 October 2026. It is general guidance in plain language, not advice for your particular project. Tell us if something is wrong or unclear.