Buyer's Guide 2008: Software Plug-Ins
While you can do just about anything to an image with Photoshop, some tasks can be fairly labor-intensive or tricky to accomplish unless you know exactly what to do. Plug-ins are applications that extend the capabilities of Photoshop, most often by providing a more automated, simplified approach to an otherwise complex Photoshop task. They typically launch from within Photoshop and use a customized window with specialized tools for the job at hand.