The basic idea is this: a reverb processor is a device that uses an algorithm (magical math) to turn a source sound into the reverberant version of that sound. That algorithm can be configured in a large number of ways, but the designers generally like to set up some basic configurations that imitate the typical reverbs that we frequently come across. Customarily, the reverb types are Rooms, Halls, Chambers, Plates, and Ambiences.
From the blog
