Victor - there are a number of different styles out there and this happens to be what I use;
It does two things for you:
1. It raises your flash well above the optial axis of your camera which means a longer lens does not cast a shadow on your subject; and
2. When shooting in portrait mode; your flash can be set above the camera so that the light does not come from the side, but rather from above the camera. This tends to give me better results.
I do use it with a hot shoe adaptor that connects to the camera's synch port, but could also trigger it as a slave using the camera's built-in flash.