The name of this field says almost everything about it. If you put an ‘X’ in it, then the column will be displayed as checkbox. The type of the field which is used as checkbox should be set to ABAP_BOOL or any other CHAR(1) type.
If you use editable grid then once the checkbox is checked, the cell of the table behind it will be filled with value ‘X’.
Figure 41 ZDEMO_AIN_CL18 Checkbox on editable grid