There are several buttons included in this dialogue box.
Buttons look as if they are raised of the screen and usually have a small shadow around the edge.
The Save and Cancel buttons are at the bottom corner of the picture but there are a several other buttons here in the dialogue box. This down arrow lets the user know there are more contents listed below. Click on it once and hold, like the file menu, and a list of other items will appear. The New Folder button will create a new folder which you can then open and save a file into. This button will close the window which is currently open.