Files that gives you control over the display of modules or components.
Override files are placed in special folders and can be used in place of the standard layout files. Unlike Template Overrides, which override layout files of the same name, Layout Overrides are additional layout files that give you more options and control.
A collection of related articles. Sub-categories start at one organiza- tional level below categories. Since Joomla 1.6, you may have as many levels of sub-categories as you please (called nested categories).
Languages are perhaps the most basic and critical extension type. Languages are packaged as either a core language pack or an extension language pack. These packages consist of INI files which contain key/value pairs. These key/value pairs provide the translation of static text strings within Joomla! source code. This allows both the Joomla! core and third party components and modules to be internationalised. Core language packs also include an XML meta file describing the language and providing information about the fonts to use for PDF content generation.
Reference: http://docs.joomla.org/Glossary
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