We might divide a page template into a header, content, sidebar and footer where these are in separate files. The content will change most between pages, so rather than having a content file, we include the content into a page file which pulls in the individual template files and defines the unique features of that page. The unique features of a page will be the title, description and article content. We can define these at the start of the page template with say PHP code to set the value of variables that are used by the other templates such as the header template. Then we assemble the page by including the required templates and inserting the content.
In this tutorial I will introduce the concept of modular design of web templates. This is a way to create easily adaptable and maintainable web templates from simple ones right up to the most complex. A website template is a framework for a website containing the code for web pages, graphic elements and a styling template. Most people think of a template in terms of it‘s visual appearance but this is really the theme.