The Layers palette includes several types of layers: Background, type, and image (non-type). The Background layer—whose name appears in italics—is always at the bottom of the stack. Type layers—layers that contain text—contain the type layer icon in the layer thumbnail, and image layers display a thumbnail of their contents. In addition to dragging selections from one Photoshop image to another, you can also drag objects created in other applications, such as Adobe Illustrator, Adobe InDesign, or Macromedia Flash, onto a Photoshop image, which creates a layer containing the object you dragged from the other program window.
It is not necessary for a Photoshop image to have a Background layer. However, if you don't have a Background layer, the background will take on the properties of the layers and their opacities, which is more memory intensive than an object layer.
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