In most cases, an extension for Joomla component consists of one or more modules, and a search mambot. A component which performs an action with the data (add / edit / delete) module displays the data, and mambot allows you to search according to this component.

Components

Components - is expanding Joomla, which constitute a functional system and support interact with the user, components are in the Joomla forums and file archives, galleries, and statistics gathering system, backup, etc. Managing users, partition - is also a component, but working only in the administrative part of the site. A Adding and display materials - components working in the admin, and a public part of the site. Component search is only the public part

Modules

Modules, in contrast to the components, perform the functions of displaying any information, and in most cases do not perform any operations for adding / modifying data. Another important difference between modules of the components is the ability to copy modules. Typically, the modules are located in the left and right column with three-column layout. An example is the module navigation menu, calendar, list of popular articles, etc.

Mambots in Joomla 1.5 (Plug-in Joomla 1.5)

Mambots (plugins) - these are small features enable you to manipulate data before rendering their users of the site. An example of the mambot - search the text of conditional code, which he programmed and replace it with another.