plug-in

When referring to a digital image-editing computer application (such as Adobe Photoshop), a plug-in is a software addition to the application that enhances its capabilities, typically to create visual effects or to increase the range and/or types of the application s image-processing filters.

plug-in

Usually third-party software which adds to the capabilities of a computer application.

plug-in

Software that either allows users to access peripherals, such as a scanner, through their image manipulation software or adds features to an existing application, such as filters or third-party add ons.