The program that uses client/server models. It provides the communication between the browser on the client device and the server where the website files and database are stored. Joomla works with two leading web servers: Apache and Microsoft IIS (Microsoft's Internet Information Server).
The default Joomla! layouts for menu items which use the Category Blog Layout. Blog format presents some or all of the articles in a particular category or sub-category. The standard presentation usually includes an article’s title as a link, followed by some introductory text and a Read More link.
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.