Collections are the numbers of data reports including subcategories.
For example, in the report section, there is a collection known as “Life Cycle” with subcategories namely acquisition, engagement, monetization, and retention.
Likewise, there is a collection called “User” with subcategories namely demographics and tech.
Go to the Report section and start navigating through your collections.
These collections are used regularly if you are using GA4.
You can also create your own collections within the report section.
Watch our video above for a better understanding of collections in Google Analytics 4, also there is some interesting information inside the video.
Also click to watch video on How to create a new collection in GA4?