Designers often create multiple compositions or comps of a page layout to show clients. Using layer comps, you can create, manage, and view multiple versions of a layout in a single Photoshop file.
A layer comp is a snapshot of a state of the Layers palette. Layer comps record three types of layer options:
Layer visibility—whether a layer is showing or hidden.
Layer position in the document.
Layer appearance—whether a layer style is applied to the layer and the layer’s blending mode.
You can export layer comps to separate files, to a single PDF, or to a web photo gallery.
Choose Window > Layer Comps to show the palette.