While the look and feel of the Administrator back-end can also be modified and customized, it is most often the front-end that is customized this way. The Joomla Administrator is what our members will learn to interact with when they modify their websites.
The Administrator provides the main interaction with the power of the Joomla CMS. While Articles are sometimes also created from the front-end, they are most commonly created from the Administrator. Modules are created and assigned to Template Positions in this area as well.
The combination of the front-end and the Administrator create a complete Joomla CMS website.