Conversion is a valuable action completed by a user, especially in advertising and measurement contexts.
It matters because analytics turns marketing activity into decisions. Without clear measurement language, teams may misread performance, overvalue the wrong channels, or miss the actions that actually drive revenue.
Example
A completed order may be a conversion for an advertising campaign, while an earlier product-view event is only a step toward it. Define which action is being counted and distinguish advertising conversions from GA4 key events when comparing interfaces.