Defining a Datagrid column
When a Datagrid component is first added to the workspace, column headers are automatically given generic names (Column 1, Column 2, and so on). To make the column headers more useful, you likely want to rename them.
In addition, for a Datagrid to be useful, you must tell App Builder where to find the contents for each column, whether to allow users to select or alter the contents of cells, and what format to apply to the contents of each cell in a column.