Module Modules are lightweight and flexible extensions used for page rendering. These modules are often “boxes” arranged around a component on a typical page. A well-known example is the login module. Modules are assigned per menu item, so you can decide to show or hide (for example) the login module depending on which page (menu item) the user is currently on. Some modules are linked to components: the “latest news” module, for example, links to the content component (com_content) and displays links to the newest content items. However, modules do not need to be linked to components; they don't even need to be linked to anything and can be just static HTML or text. Modules are managed in the Joomla! Administrator view by the Module Manager. Joomla default modules: Archived Articles? Articles – Newsflash Articles – Related Articles Articles – Categories Articles Category Banners? Breadcrumbs Custom HTML Random Image Search? Statistics Syndication Feeds Feed Display Footer? Language Switcher Latest News Latest Users Login? Menu? Most Read Content Weblinks Who’s Online Wrapper Reference: http://docs.joomla.org/Glossary
Hack (Core Hack) Adjusting a core Joomla file (i.e., the files that you uploaded before installing Joomla!). Any changes you make to core files will be overwritten during the next update, thus core hack is not recommended. In most cases, there are alternative workaround to change Joomla without hacking the core.
Chrome The visible graphical interface features of an application are sometimes referred to as chrome. See Applying custom module chrome for information about how to modify the look of modules (in other words, the module "chrome"). Reference: http://docs.joomla.org/Glossary
