What Does Combination Box (Combo Box) Mean?

A combination box, or combo box, is a specialized control coded in modern object-oriented languages such as Java, .Net and Microsoft Visual Basic. It is a drop-down list box that includes an opportunity for the user to either choose an option from the list, or type in their own option in the top line of the text box.

Techopedia Explains Combination Box (Combo Box)

The combination box allows for a flexible kind of input. Here, users can either make a predetermined choice, or input their own information into a form.