Alfresco Explorer, one of the Alfresco's built-in web applications, provides an intuitive user interface, so that the beginners of the system can start using it without any specialized user training.
You have been introduced to the key terminology in Alfresco such as Alfresco Explorer, administrator console, space, content, category, aspects, actions, and rules.
When Alfresco starts, it reads all the default configuration files, and then reads the customized configuration items in the extensions folder. So, depending on the type of item, the customization either extends, or overrides the default configuration item. You have flexibility in choosing the database and membership framework of your choice. You can configure e-mail, multilanguage support, and look and feel of the application. The applications built on top of Alfresco are highly configurable, customizable, and extendible.
In the next chapter you will understand the concepts and the underlying framework behind the Alfresco security...