Joomla is a fantastic piece of software and once you know how to use it,
it's very user friendly. Certainly Joomla 1.5 has taken a huge step
forward in usability. But for someone new, certainly for someone who
never used a CMS before, it can be quit overwhelming in the beginning.
We all had the same feeling the first time we installed Joomla: where do
I start? Well a good start of course is to learn the basics. So if you
are already familiar with Joomla, you can stop reading now (really!). In
this article I'll explain the difference between the 3 types of
extensions for Joomla: components, modules and plugins.
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Components
A
component is in fact a seperate application. You can think of a
component as something that has it's own functionality, it's own
database and it's own presentation. So if you install a component, you
add an application to your website. Examples of components are a forum, a
newsletter, a community system, a photo gallery, etc. You could think
of all of these as being a seperate application. Everyone of these would
make perfectly sence as a stand-alone system. A component will be shown
in the main part of your website and only one component will be shown. A
menu is then in fact nothing more then a switch between different
components. You can compare it a bit with your windows taskbar, where
you see a tab for each open application.
Modules
Modules are
extensions which present certain pieces of information on your site.
It's a way of presenting information that is already present. This can
add a new function to an application which was already part of your
website. Think about latest article modules, login module, a menu, ... .
Typically you'll have a number of modules on each web page. The
difference between a component and a module is not always very clear for
everybody. But if you think about it, it's really not that difficult. A
module doesn't make sense as a standalone application, it will just
present information or add a function to an existing application. Take a
newsletter for instance. A newsletter is a component. You can have a
website which is used as a newsletter only. That makes perfectly sense.
Although a newsletter component probably will have a subscription page
integrated, you might want to add a subscription module on a sidebar on
every page of your website. You can put this subscribe module anywhere
on your site. You'll probably agree with me that a site with just a
subscription module and no actual newsletter component would be rather
ridiculous.
Plugins
They used to be called mambots in Joomla
1.0.x, but since Joomla 1.5.x they're called plugins. A plugin is a
function which is performed on a part of Joomla before this part is
shown. This part can be on content, on the editor, on the complete
system, etc. This might seem a bit abstract, but you'll understand it
with an example. Let's take one of the plugins of Ulti Joomla as an
example: Ulti Reflection. This is a plugin which can make a reflection
of the images you use in your content articles. To use this you just
have to put something like
inside your content. Before the content
is shown to the user, the Ulti Reflection plugin will scan the content
to find the {reflection} tag. If it finds the tag, it will replace the
tag with the image and it's reflection. Be carefull not to put to many
plugins one your website, because some of them can really slow down your
site.
If the difference between the three types of extensions
is still not completely clear, then I advice you to go to admin pages of
your joomla installation and check the components menu, the module
manager and the plugin manager. Joomla comes with a number of core
components, modules and plugins. By checking what they're doing, the
difference between the three types of building blocks should become
clear. You can also check out the official Joomla extensions page.
Browse through the extension categories and you'll be amazed about the
extension possiblities you have for your site.
from: http://www.ultijoomla.com/blog/Joomla-Components-Modules-and-Plugins.html
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