A template is used to manipulate the way content is delivered to a web browser or screen reader. Here are some ways you can employ this on your Joomla!-powered site.
The template is the place where the design of the main layout is set for your site. This includes where you place different elements (components, modules, and plugins), which are responsible for different types of content. For example: The various menus (you can chose from existing options and create your own) Advertising banners Polls The main body of the page (you can select from different styles such as typical blog layout, a news article, etc.)
If the template is designed to provide choices, you can also “dynamically” alter the content placement on your site, perhaps putting the main menu on the right or left side of the screen.