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Glossary

Conversion rate

The share of visitors who do the thing you wanted.

A hundred visitors, three purchases, 3% conversion. Doubling it doubles revenue without a single extra visitor, which is why it is usually cheaper to improve conversion than to buy more traffic.

Rates vary enormously by context: 1–3% is typical for e-commerce, 20–40% for a well-matched email opt-in. Comparing yours to an average from a different context tells you nothing.

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