Bound, Unbound, and Calculated Controls

You can place three types of controls on a report: bound, unbound, and calculated. Bound controls are tied to data within a field of the table or query underlying the report. Unbound controls, such as logos placed on reports, aren't tied to data. Calculated controls contain valid expressions; they can hold anything from a page number to a sophisticated financial calculation. Most complex reports have a rich combination of bound, unbound, and calculated controls.