An optional file that allows the site administrator to override any language string in core Joomla or in an extension (other than installing a new language). There are two override files, one for the front-end and one for the administrative back-end.
In Joomla! an Article is a piece of content consisting of text (HTML), possibly with links to other resources (for example, images). Articles are the basic units of information in the content system and the bottom level in the content hierarchy. Since Joomla! 2.5 , each Article is in exactly one Category. A Category can be in another Category making it a sub Category. It is also possible to have Uncategorised Articles. These articles exist without being associated with any Category. Before Joomla! 2.5 and earlier versions, an Article was the third level in the hierarchy Sections ? Categories ? Articles. Now an Article is a bottom level and will alway be the second level or greater in hierarchy. Category ? Articles Category ? sub Category ? Articles Category ? sub Category ? sub Category ? Articles Articles are maintained using the Article Manager (see the Content Article Manager for or the Content Article Manager for ) which can be reached in the Administrator (Back-end) by clicking on the Content menu, then the Article Manager menu item. Reference: http://docs.joomla.org/Glossary
The mechanism that offers users a stored view of (part of) a web page so that does not have to be pulled from the database. Joomla core offers three levels of caching: Page caching View caching Module caching. By default, Joomla does not cache any content. When caching is switched on, the stored views for this are stored in the filesystem for Joomla ../cache/page/ folder.
