A collection means a group of elements or an arrayAn array is a collection of data. You can think of this data type as a data holder. Smart information can be found here: https://u-helmich.de/inf/BlueJ/lexikon/A-D/Array-Initialisierung.html. A Powerapps collection means that it is an arrayAn array is a collection of data. You can think of this data type as a data holder. Smart information can be found here: https://u-helmich.de/inf/BlueJ/lexikon/A-D/Array-Initialisierung.html with which the data can be stored in the Powerapps memory. Later, this stored data can be used in many ways. You can save the data from a PowerApps collection in any data source such as SharePointSharePoint is the intranet solution from Microsoft. SharePoint Online SharePoint online (SPO) is usually included in your Microsoft 365 subscription, but can also be purchased directly. SharePoint Online has the advantage that there is no need to operate a separate server, but it lacks the customization options of a self-hosted installation of SharePoint.Although SharePoint Online is limited to core functions... Online lists, Excel spreadsheets, etc.
You can find a very good overview of the use of collections in PowerApps here: