Hi Hawkide,
If you select a table or query as the record source for a form you can then select from the list of fields available for the control source of text boxes and other controls on the form. Text boxes set up this way are Bound controls.
If you need to do a DLookup or other calculated control, it will be unbound. If you create a new text box, it will say unbound until you select a control source. If there is no record source selected for the form all controls will be unbound. There are other features available such as linking subforms to the data in the main form.
There are advantages to both. If you need more assistance let me know what you are trying to accomplish.
Hoping this helps,
alr