What is a Menu URL Alias?

In PHPDS, a menu has an ID (for example 2847185666) and a name (for example System Settings). The later is used to display a name on the pages, and generate friendly urls. This name can come from the plugin settings, the language file, or the corresponding entry in the menu setting.
If the friendly urls setting is on, PHPDS generates URLs with this name ; however, if you want to use another name (to avoid punctuation or accents, for example), you can specify an alias.