Template overrides are a way of changing the way Joomla shows something without changing the basic or core Joomla system. A template override is a layout file that is placed in a special subfolder of the template. If found, it will replace the standard layout file for that template.This means that as Joomla is upgraded to new versions you will not have to repeat all the changes you made.

Options (also known as parameters) are settings used to customise modules, components, plug-ins and templates. The core extensions in Joomla offer many options that the site administrator can set to change the behavior of the site without requiring any programming knowledge.