Using the mouse to drag a file to an application and drop it there. If the two are compatible the file will be opened within the application. This can be useful when opening documents.
Clicking an object, holding the mouse button down while moving the cursor and the object to a destination (dragging), and then releasing the button to insert the object at the destination (dropping).
Some software systems such as the Mirror Image system utilize this method in order to allow the user to move and associate images and documents without having to enter any additional information.