Documentation explicitly for Backlight 2, as differs from the previous version, is here. Much of the version 1 documentation still applies in Backlight 2, and you may find it below.
The Designer is where much of Backlight's magic happens. It allows you to customize the appearance and features of your website's galleries and pages.
The Publisher is a publish services plugin for Lightroom, and allows you to create and manage albums and albums sets, and to send images from Lightroom to Backlight.
Backlight includes several standard modules used to create Page Templates, Album Set Templates, and Album Templates. These modules form the backbone of Backlight's Designer.
We name our design modules after animals. The current version of Backlight uses “Pangolin” modules.