What functionality do combo boxes provide in Access forms?

Combo boxes in Access forms offer a versatile functionality that enhances user interaction with data entry. Specifically, they enable users to both enter new values and select from a predefined list of options. This dual capability is particularly beneficial in scenarios where there are standard choices available—like categories or types—but users may also need to introduce new values that aren't present in the list. This flexibility helps maintain data integrity while accommodating unique or diverse inputs.

The design of combo boxes makes them ideal for use cases where a mixture of fixed options and freeform input is necessary. They help streamline the data entry process, reduce errors related to manual entries, and ultimately enhance the overall user experience in forms.