Layers divide the page into discrete planes, as though the components of the illustration were drawn on separate tracing paper overlays. A page can be made up of many layers, each containing many objects.
Each object in a page resides on a layer. You can either create layers before you draw or add layers as needed.
The Layers panel displays the current state of all layers in the current page of a publication. The name of the active layer is highlighted. The stacking order is the order in which objects appear on the page and determines how objects on one layer overlap objects on another. Joomag places the most recently created layer on the top of the stack. You can rearrange the order of layers and of objects within layers, and you can move objects onto them.
Refer to the following articles for more information: