You can apply special effects to layers using Photoshop's built-in layer styles. With these styles, you can add shadows, glows, and 3-D appearances to your layers. Photoshop's Styles panel enables you to easily apply predefined combinations of styles to your image or create your own.
Apply a Drop Shadow
Apply an Outer Glow
Apply Beveling and Embossing
Apply Multiple Styles to a Layer
Edit a Layer Style
Using the Styles Panel
You can apply a drop shadow to make a layer look as though it is floating above the image canvas.