What it means
Some users see variant A and others see variant B, then results are compared using a metric chosen in advance.
Term in plain language
A/B testing
A comparison of two variants using a controlled audience split.
Why it matters
The test helps separate a real effect from random variation and subjective preference.
Example
Two button labels are compared by form-completion rate under the same conditions.
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Title
The HTML document title shown in the browser tab and often used as the search-result heading.
Description
A concise meta description of page content that a search engine may use in the result snippet.
H1
The main visible HTML heading that states the primary topic of a particular page.