What are templates and their uses?

In ExpressionEngine, a Template represents an HTML page on your site, although unlike a traditional HTML page, there isn't an actual file on your server. Instead, ExpressionEngine takes care of turning these Templates into web pages.

The benefit of this approach is that information can be presented dynamically by using special Tags within the templates. The secondary benefit of this approach is that the pages can be managed from within the ExpressionEngine Control Panel using web browser, so no longer need to use FTP to upload files to server whenever a page changes.

Usually, each of the Templates will represent an entire web page, although it is possible to embed templates within other templates to use common site elements in all pages, like headers or footers.

ExpressionEngine templates are managed from within EE Control Panel TEMPLATES page. Templates are organized into sets of templates called Template Groups, which works as virtual folders.

We can customize anytime of our requirements. It can be edited, deleted, change the design, everything can possible in later stage also.