•A component is the largest and most complex extension of them all.
•They can be seen as
mini-applications.
•There are two parts in a component, an administrator part and a site part.
•Every time a Joomla page loads, a component is called to render the main page body.
•Components are the major portion of your page because a component is driven by a menu item and every menu item runs a component.
•For example:
com_content, com_registration
–Admin head menu > “Components”