In plain English
It replaces what earlier versions of Google Analytics called a goal. You mark an existing event as key, and it then appears in reports as an outcome rather than one interaction among many.
Only a few should be key. Marking eight events as key produces a report where nothing stands out, which defeats the purpose of marking any.
What to know
Why it matters
A GA4 property with no key events reports traffic and nothing else. Marking the two or three events that represent real outcomes is the step that makes the data commercially useful.
Common mistakes
FAQs
How many key events should I have?
Two or three. The actions that genuinely represent business value.
Are key events the same as conversions?
Closely related. Key event is the GA4 term; conversion is the broader concept.
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