Investopedia explains 'A-B Split'
A-B split has been been used for mailing campaigns in the past, but has also successfully adapted for use in interactive media, for testing the effectiveness of e-mail blasts and banner advertisements.
For example, an email campaign by a newsletter publisher may include a specific "call to action" - such as subscribe within 48 hours to receive a 20% discount - embedded in the message to half the target audience, and no call to action (i.e. no solicitation to subscribe or mention of a discount) in the message to the other half. This will enable the publisher to determine if the "call to action" really works, and whether the response rate is good enough to justify the 20% discount.
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