It is from the manifest file that Joomla! is able to determine
what type the extension is, what it is called, what files are included, and what
installation procedures are required.
Components
Components are undoubtedly the most fundamental Joomla! extensions. Whenever
Joomla! is invoked a component is always called upon. Unlike other extensions,
output created by a component is displayed in the main content area. Since
components are the most fundamental extension, they are also generally the
most complex.
One component of which all Joomla! administrators will be aware, is the content
component. This component is used to display articles, content categories, and
content sections.
In addition to outputting component data as part of an XHTML page, we can output
component data as Feeds, PDF, and RAW documents.
Many components tend to include, and sometimes require, additional extensions
in order for them to behave as expected. When we create our own components
it is generally good practice to add 'hooks' in our code, which will enable other
extensions to easily enhance our component beyond its base functionality.
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