This is one of the most used modules in Cornerstone, since it is dealing with such an important part of the site - pictures. This module can display separtate images or the series if images called "galleries".
Some of the modules in Cornerstone can combine content of "simplier" modules. Articles can contain videos, pictures and even questionnaire forms, that are stored in particular modules. Shop items can store pictures in the Images module, and articles in a linked article module.