As you may remember from before objects are stacked according to the time they were created. Newer objects always are on top of previously created objects. You are free to rename that layer and create new layers. Layers themselves can be stacked and objects in the higher layer will be seen in front of objects on lower layers.
Layers are an important tool in grouping objects by category.
For example if you create a design for a Web page that has navigational elements that change and static i.e., non changing elements, you would put them on different layers. In the displayed panel above you can see that there are two layers. It is part of every Fireworks document and will contain slices, hotspots, and other Web related information. If you remember the red circle from the previous lesson you will see it here as object in the layer panel. There is only one object here and it is a vector object or path.