A family of Microsoft relational database management systems designed for ease of use.
The typocal reason for that is because the form has no records to display AND the form can not add any new records.
Common reason for the form to not display any existing records:
It's filtered to no records
It;s in data entry mode
The record source query joins to a table with no matching records
. . .
Common reasons why the form can not add any new records"
AllowAdditions property is set to No
The record source query is not updatable