default button

In the vast majority of dialog boxes there is a button that looks slightly different to any other buttons, maybe with more of a 3D look or maybe a slightly different colour.

This is what can be described as the default button. This means that this is the button that gets pressed when you press the ENTER key, no matter which control has "focus".

So for example, when you close a document you may get a message asking whether you want to save changes, you will probably have 3 buttons - yes, no and…