WPF Visibility

The difference is that Visibility.Hidden hides the control, but reserves the space it occupies in the layout. So it renders whitespace instead of the control. Visibilty.Collapsed does not render the control and does not reserve the whitespace. The space the control would take is 'collapsed', hence the name.

The exact text from the MSDN:

Visible: Display the element.
Hidden: Do not display the element, but reserve space for the element in layout.
Collapsed: Do not display the element, and do not reserve space for it in layout.