Modules are built-in 'extensions' that are used to display your content to the website visitors. Using our example in the last recipe, you saw that you can make your site show a different template, based on the 'section' that is called. A module can be used in a similar fashion, showing components or other modules such as the Login module (also known as mod_login).
The module positions are placeholders, which are used to display content with the associated module.
Here is an example of the Login module being displayed in the left module position on the default Joomla! template rhuk_milkyway:
The designer of a template has full control over module position locations and their names. You might recognize left, right, and banner. These are module positions available in the default Joomla! setup.
Note
Module positions when left is right
LEFT, RIGHT, and other module positions are names only and do not always reflect the geographical position on the screen...