Hi @BobDang-6703 ,
The DetailView is a data control. It's used by recording the data from a data source. It's format is fit for some details of one person or one thing. So, the highlighted part means that you could use like this:
Assume you have a gridview to record student borrowing books. In the gridview table, you have some fields,such as the student's name, the name of the book, when and so on. If you want to get other details of the student and don't want to make the gridview table complicated，you could create the detailview to recording the detail of the student.
At this time, you could create a link on the student's name. After clicking the link,you will go to the detailview.
In order to understand my description more effectively, please create a detailview yourself to see the format.
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