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A user-defined text attribute registered in the GA4 admin that allows you to see and filter custom event parameters or user properties in your reports.
GA4 does not automatically create reporting columns for every random piece of data you decide to send it via Google Tag Manager.
If you send an event parameter called author_name whenever a blog post is viewed, GA4 receives it and stores it in raw the database (BigQuery). However, if you want to see a table in the GA4 UI showing "Pageviews by Author Name," you must register author_name as an Event-scoped Custom Dimension.
If you fail to register custom dimensions, your data is effectively buried.
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Additional pieces of metadata sent alongside an event to provide specific context about the action that occurred.
Attributes that describe cohorts or segments of your user base, such as their language preference, subscription tier, or lifetime value.
A user-defined numerical value registered in the GA4 admin that allows you to sum or average custom data points.