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A/B Test is a product or analytics concept that helps measure whether users find value and where the product leaks.
A/B Test matters because shipping code is not the same as proving activation, conversion, retention, or revenue. It gives builders a precise word for the thing they are changing, debugging, reviewing, or shipping.
Plainly
Think of A/B Test as a scoreboard for what people do in the app. It gives one small job a clear name so the whole app is easier to understand.
In practice
Use it after a feature ships to verify real behavior instead of relying on screenshots or vibes. In practice, name the owner, input, output, failure mode, and proof before relying on A/B Test.