Label controls usually provide information in the user interface (UI). Historically, a Label has contained only text, but because the Label that ships with Windows Presentation Foundation (WPF) is a ContentControl, it can contain either text or a UIElement. For more information, see Controls Content Model Overview.
A Label provides both functional and visual support for access keys. It is frequently used to enable quick keyboard access to controls such as a TextBox. To assign a Label to a Control, set the Label.Target property to the control that should get focus when the user presses the access key.