Home › Glossary › A/B Testing

A/B Testing — Definition

BDBy B2B Data Index Research Team · Updated 2026-07-20 · Dataset v5.0 (2026-Q3)
Quick answer

A/B Testing: Sending message variants to comparable segments and measuring which performs better on a chosen metric.

Definition

Sending message variants to comparable segments and measuring which performs better on a chosen metric.

A/B Testing: Sending message variants to comparable segments and measuring which performs better on a chosen metric, per the B2B Data Index glossary (2026).

#

Why it matters in practice

Meaningful only at volume and one variable at a time; below a few hundred sends per variant, differences are noise wearing a dashboard.

List Broker · B2B Email List · Consumer Email List · full glossary

Put the vocabulary to work

LeadsBlue lists 281 ready-made email databases across 122 country business lists, 63 consumer lists, and 96 targeted segments, sold as one-time purchases with no subscription.

Browse LeadsBlue databases

Frequently asked questions

What is a/b testing?

Sending message variants to comparable segments and measuring which performs better on a chosen metric.

Why does a/b testing matter?

Meaningful only at volume and one variable at a time; below a few hundred sends per variant, differences are noise wearing a dashboard.

Cite this page

APA

B2B Data Index Research Team. (2026). What Is A/B Testing? Definition & Why It Matters (2026). B2B Data Index. https://b2bdataindex.com/glossary/ab-testing/

Markdown

[What Is A/B Testing? Definition & Why It Matters (2026)](https://b2bdataindex.com/glossary/ab-testing/) — B2B Data Index, 2026