Album : A set of photos. An album can include sub-albums. A photo can belong to several albums.

Association : A photo can be associated to one or several albums. A photo associated to no album is called an “orphan” photo.

CSS : description language, used to describe graphic parameters of Piwigo's pages. For example, link color.

Gallery : Each installation of Piwigo is a gallery.

MySQL : databases engine. This is where Piwigo saves data like photo description or user comments.

PHP : programming language used by Piwigo.

Physical association : (only when using synchronization to add photos) after synchronization, each photo is associated with its physical album.

Physical album : An album that is linked to a directory in the filesystem.

Private album : when an admin marks an album as private, you must give explicit permission for each user or group.

Release : equivalent for ”version”. See more on release_and_branchs

Remote site : photos can be accessed and managed from a remote location by Piwigo. The remote site must be reachable via HTTP.

Synchronization : during synchronization, Piwigo will scan folders and files under the ”galleries” directory and create corresponding albums and photos in the database.

Theme : everything related to display is in the theme. It includes CSS stylesheets, icons, template files.

Template : HTML pages models. Known as *.tpl files. PHP read templates files and convert them in pure HTML language. Compared to HTML files, template files may include loops or conditions.